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Papers

EN NUESTRO GRUPO AMAZING QUANTUM DE LA UNIVERSIDAD DE CHILE, ESTAMOS COMPROMETIDOS CON REALIZAR INVESTIGACIÓN DE CALIDAD. EN ESTA SECCIÓN PODRÁN ENCONTRAR NUESTROS ARTÍCULOS CIENTÍFICOS PUBLICADOS O SU VERSIÓN EN ARXIV.

Átomo
Wigner function Fock-like states

WoS Researcher ID C-4763-2018

Google Scholar

https://scholar.google.cl/citations?user=5Rwd12MAAAAJ&hl=en

ORCID

https://orcid.org/0009-0000-0870-1942

Wigner function Fock-like states

​[18] 2024

Controlling directional propagation in driven-dissipative 2D photonic lattices.

Bastian Real, Pablo Solano, and C. Hermann-Avigliano.

[17] 2024

Transport of non-classical light mediated by topological domain walls in a SSH photonic lattice.

​Gabriel O'Ryan, Joaquín Medina Dueñas, Diego Guzmán-Silva, Luis EF Torres, and C. Hermann-Avigliano. Scientific Reports, volume 14, Article number 12435.

[16] 2024

Analytic Evolution for Complex Coupled Tight-Binding Models: Applications to Quantum Light Manipulation.

​Santiago Rojas-Rojas, Camila Muñoz, Edgar Barriga, Pablo Solano, Aldo Delgado, and C. Hermann-Avigliano. Phys. Rev. Research 6, 033224.

[15] 2023

Emergence of Non-Gaussian Coherent States Through Nonlinear Interactions.

​M. Uria, A. Maldonado-Trapp, C. Hermann-Avigliano, P. Solano. Phys. Rev. Research 5, 013165.

[14] 2022

Transmission Estimation at the Fundamental Quantum Cramer-Rao Bound with Macroscopic Quantum Light.

​Timothy S. Woodworth, Carla Hermann-Avigliano, Kam Wai Clifford Chan, Alberto M. Marino. EPJ Quantum Technol. 9, 38.

[13] 2022

Collective enhancement in dissipative quantum batteries.

​Javier Carrasco, Jerónimo R. Maze, C. Hermann-Avigliano, Felipe Barra. Phys. Rev. E 105, 064119.

[12] 2021

​​​​​​​Quadrature protection of squeezed states in a one-dimensional topological insulator.

J. Medina Duenas, G. O'Ryan Pérez, C. Hermann-Avigliano, L. E. F. Foà Torres. Quantum Journal, volume 5, page 526.

[11] 2020

Transmission Estimation at the Cramér-Rao Bound for Squeezed States of Light in the Presence of Loss and Imperfect Detection.

​​Timothy S. Woodworth, Kam Wai Clifford Chan, C. Hermann-Avigliano, and Alberto M. Marino. Physical Review A 102, 052603.

[10] 2020

Deterministic Generation of Large Fock States.

​M. Uria, P. Solano, and C. Hermann-Avigliano. Physical Review Letters 125 (9), 093603.

[9] 2020

Deep learning-based classification of high intensity light patterns in photorefractive crystals.

​M. Ivanović, A. Mančić, C. Hermann-Avigliano, L Hadžievski, A Maluckov. Journal of Optics 22 (3), 035504.

[8] 2019

Manipulation of multimode squeezing in a coupled waveguide array.

S. Rojas-Rojas, E Barriga, C. Muñoz, P. Solano, and C. Hermann-Avigliano. Physical Review A 100 (2), 023841.

[7] 2019

Spatial rogue waves in photorefractive SBN crystals.

​C. Hermann-Avigliano, I. A. Salinas, D. A. Rivas, B. Real, A. Mančić, C. Mejía-Cortés, A. Maluckov, and R. A. Vicencio. Optics Letters Vol. 44, Issue 11, pp. 2807-2810.

[6] 2018

Observation of localized ground and excited orbitals in graphene photonic ribbons.

​C.Cantillano, S. Mukherjee, L. Morales-Inostroza, B. Real, G.Cáceres-Aravena, C. Hermann-Avigliano, R. R. Thomson and R. A. Vicencio. New J. Phys. Volume 20, Number 3.

[5] 2017

Phase sensing beyond the standard quantum limit with a variation on the SU(1,1) interferometer.

​Brian Anderson, Prasoon Gupta, Bonnie Schmittberger, Travis Horrom, C. Hermann-Avigliano, Kevin Jones and Paul Lett. Optica Vol. 4, Issue 7, pp. 752-756.

[4] 2015

Microwave probes Dipole Blockade and van der Waals Forces in a Cold Rydberg Gas.

​R. Celistrino Teixeira, C. Hermann-Avigliano, T. L. Nguyen, T. Cantat-Moltrecht, J.M. Raimond, S. Haroche, S. Gleyzes and M. Brune. Phys. Rev. Lett. 115, 013001.

[3] 2015

A scheme for efficient generation of mesoscopic field states superposition in cavity QED.

​C. Hermann-Avigliano, N. Cisternas, M. Brune, J.M. Raimond, and C. Saavedra. Phys. Rev. A 91, 013815.

[2] 2014

Long coherence times for Rydberg qubits on a superconducting atom chip.

​C. Hermann-Avigliano, R. Celistrino Teixeira, T. L. Nguyen, T. Cantat-Moltrecht, G. Nogues, I. Dotsenko, S. Gleyzes, J.M. Raimond, S. Haroche, and M. Brune. Phys. Rev. A 90, 040502(R).

[1] 2011

Conclusive discrimination among N equidistant pure states.

Luis Roa, Carla Hermann-Avigliano, R. Salazar, and A. B. Klimov. Phys. Rev. A 84, 014302.

[19]

Characterization of generalized coherent states through intensity-field correlations

I. S. Valdivieso, V. Gondret, G. Hartmann S., M. Uria, P. Solano and C. Hermann-Avigliano

Phys. Rev. Research 8, 023118 (2026)

Non-Gaussian quantum states of light are essential resources for quantum information processing and precision metrology. Among them, generalized coherent states (GCSs), which naturally arise from the evolution of a coherent state with a nonlinear medium, exhibit useful quantum features such as Wigner negativity and metrological advantages [Phys. Rev. Res. 5, 013165 (2023)]. Because these states remain coherent to all orders, their nonclassical character cannot be revealed through standard intensity-intensity correlation measurements. Here, we demonstrate that the intensity-field correlation function alone provides a simple and experimentally accessible witness of nonclassicality. For GCSs, any deviation of this normalized correlation from unity signals nonclassical behavior. We derive analytical results for Kerr-generated states and extend the analysis to statistical mixtures of GCSs. The proposed approach enables real-time, low-complexity detection of quantum signatures in non-Gaussian states, offering a practical tool for experiments across a broad range of nonlinear regimes.
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[18]

Controlling directional propagation in driven two-dimensional photonic lattices

B. Real, P. Solano, and C. Hermann-Avigliano

Opt. Express 32, 47458 (2024)

Controlling light propagation in photonic systems fosters fundamental research and practical application. Particularly, photonic lattices allow engineering band dispersions and tailor transport features through their geometry. However, complete controllability requires external manipulation of the propagating light. Here, we present a resonant excitation scheme to observe quasi-1D and uni-directional propagation of light through the bulk of two-dimensional lattices. To this end, we use the highly anisotropic light propagation exhibited at the energy of saddle points in photonic bands. When multiple drives with judicious amplitudes and phases are tuned to such energy, interference effects between these drives and photonic modes result in controllable directional propagation through the bulk. Similarly, one can form localized states with controllable localization degrees. We illustrate these effects by simulating driven photonic lattices composed of dissipative resonators. Our theoretical work highlights the importance of external drives for dynamically controlling directional light transport in lattices, a relevant feature for all-optical routing and processing in photonics.
Abstract
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[17]

Analytic evolution for complex coupled tight-binding models: Applications to quantum light manipulation

S. Rojas-Rojas, C. Muñoz, E. Barriga, P. Solano, A. Delgado, and C. Hermann-Avigliano

Phys. Rev. Research 6, 033224 (2024)

We present analytic solutions to the evolution in generalized tight-binding models, which consider complex first-neighbor couplings with equal amplitude and arbitrary phases. Our findings provide a powerful tool to efficiently calculate expectation values and correlations within the system, which are otherwise difficult to compute numerically. We apply our results to relevant examples in quantum light manipulation using -port linear couplers, describing the evolution of single (multi)-mode squeezing, single-photon added (subtracted) Gaussian states, and second-order site-to-site photon correlations. Significantly, our analytic results outperform standard numerical calculations. Our study paves the way for a comprehensive mathematical framework describing the spatial evolution of quantum states across a wide range of physical systems governed by the tight-binding model. Published by the American Physical Society 2024
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[16]

Transport of non-classical light mediated by topological domain walls in a SSH photonic lattice

G. O. Pérez, J. M. Dueñas, D. Guzmán-Silva, L. E. F. F. Torres, and C. Hermann-Avigliano

Sci. Rep. 14, 12435 (2024)

Advancements in photonics technologies have significantly enhanced their capability to facilitate experiments involving quantum light, even at room temperature. Nevertheless, fully integrating photonic chips that include quantum light sources, effective manipulation and transport of light minimizing losses, and appropriate detection systems remains an ongoing challenge. Topological photonic systems have emerged as promising platforms to protect quantum light properties during propagation, beyond merely preserving light intensity. In this work, we delve into the dynamics of non-classical light traversing a Su-Schrieffer-Heeger photonic lattice with topological domain walls. Our focus centers on how topology influences the quantum properties of light as it moves across the array. By precisely adjusting the spacing between waveguides, we achieve dynamic repositioning and interaction of domain walls, facilitating effective beam-splitting operations. Our findings demonstrate high-fidelity transport of non-classical light across the lattice, replicating known results that are now safeguarded by the topology of the system. This protection is especially beneficial for quantum communication protocols with continuous variable states. Our study enhances the understanding of light dynamics in topological photonic systems and paves the way for high-fidelity, topology-protected quantum communication.
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[15]

Emergence of non-Gaussian coherent states through nonlinear interactions

M. Uria, A. Maldonado-Trapp, C. Hermann-Avigliano, and P. Solano

Phys. Rev. Research 5, 013165 (2023)

Light-matter interactions that are nonlinear with respect to the photon number reveal the quantum nature of coherent states. We characterize how coherent states depart from Gaussian by the emergence of negative values in their Wigner function during the evolution while maintaining their characteristic Poissonian photon statistics. Such states have nonminimum uncertainty yet present a metrological advantage that can reach the Heisenberg limit. Non-Gaussianity of light arises as a general property of nonlinear interactions, which only requires a polarizable media, resonant or dispersive. Our results highlight how useful quantum features can be extracted from the seemingly most classical states of light, a relevant phenomenon for quantum optics applications.
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[14]

Transmission estimation at the quantum Cramér-Rao bound with macroscopic quantum light

T. S. Woodworth, C. Hermann-Avigliano, K. W. C. Chan, and A. M. Marino

EPJ Quantum Technol. 9(1), 38 (2022)

The field of quantum metrology seeks to apply quantum techniques and/or resources to classical sensing approaches with the goal of enhancing the precision in the estimation of a parameter beyond what can be achieved with classical resources. Theoretically, the fundamental minimum uncertainty in the estimation of a parameter for a given probing state is bounded by the quantum Cramér-Rao bound. From a practical perspective, it is necessary to find physical measurements that can saturate this fundamental limit and to show experimentally that it is possible to perform measurements with the required precision to do so. Here we perform experiments that saturate the quantum Cramér-Rao bound for transmission estimation over a wide range of transmissions when probing the system under study with a continuous wave bright two-mode squeezed state. To properly take into account the imperfections in the generation of the quantum state, we extend our previous theoretical results to incorporate the measured properties of the generated quantum state. For our largest transmission level of 84%, we show a 62% reduction over the optimal classical protocol in the variance in transmission estimation when probing with a bright two-mode squeezed state with –8 dB of intensity-difference squeezing. Given that transmission estimation is an integral part of many sensing protocols, such as plasmonic sensing, spectroscopy, calibration of the quantum efficiency of detectors, etc., the results presented promise to have a significant impact on a number of applications in various fields of research.
Abstract
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[13]

Collective enhancement in dissipative quantum batteries

J. Carrasco, J. R. Maze, C. Hermann-Avigliano, and F. Barra

Phys. Rev. E 105, 064119

We study a quantum battery made out of N nonmutually interacting qubits coupled to a dissipative single electromagnetic field mode in a resonator. We quantify the charging energy, ergotropy, transfer rate, and power of the system, showing that collective enhancements are still present despite losses, and can even increase with dissipation. Moreover, we observe that a performance deterioration due to dissipation can be reduced by scaling up the battery size. This is useful for experimental realizations when controlling the quality of the resonator and the number of qubits are limiting factors.
Abstract
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[12]

Quadrature protection of squeezed states in a one-dimensional photonic topological insulator

J. M. Dueñas, G. O. Pérez, C. Hermann-Avigliano, and L. E. F. Foa Torres

Quantum 5, 526 (2021)

What is the role of topology in the propagation of quantum light in photonic lattices? We address this question by studying the propagation of squeezed states in a topological one-dimensional waveguide array, benchmarking our results with those for a topologically trivial localized state, and studying their robustness against disorder. Specifically, we study photon statistics, one-mode and two-mode squeezing, and entanglement generation when the localized state is excited with squeezed light. These quantum properties inherit the shape of the localized state but, more interestingly, and unlike in the topologically trivial case, we find that propagation of squeezed light in a topologically protected state robustly preserves the phase of the squeezed quadrature as the system evolves. We show how this latter topological advantage can be harnessed for quantum information protocols.
Abstract
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[11]

Transmission estimation at the Cramér-Rao bound for squeezed states of light in the presence of loss and imperfect detection

T. S. Woodworth, K. W. C. Chan, C. Hermann-Avigliano, and A. M. Marino

Phys. Rev. A 102, 052603 (2020)

Enhancing the precision of a measurement requires maximizing the information that can be gained about the quantity of interest from probing a system. For optical-based measurements, such an enhancement can be achieved through two approaches, increasing the number of photons used to interrogate the system and using quantum states of light to increase the amount of quantum Fisher information gained per photon. Here we consider the use of quantum states of light with a large number of photons, namely the bright single-mode squeezed state and the bright two-mode squeezed state, which take advantage of both of these approaches for the problem of transmission estimation. We show that, in the limit of large squeezing, these states approach the maximum possible quantum Fisher information per photon for transmission estimation that is achieved with the Fock state and the vacuum two-mode squeezed state. Since the bright states we consider can be generated at powers much higher than those of the quantum states that achieve the maximum quantum Fisher information per photon, they can achieve a much higher absolute precision as quantified by the quantum Cramér-Rao bound. We discuss the effects of losses external to the system on the precision of transmission estimation and identify simple measurement techniques that can saturate the quantum Cramér-Rao bound for the bright squeezed states even in the presence of such external losses.
Abstract
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[10]

Deterministic Generation of Large Fock States

M. Uria, P. Solano, and C. Hermann-Avigliano

Phys. Rev. Lett. 125, 093603 (2020)

We present a protocol to deterministically prepare the electromagnetic field in a large photon number state. The field starts in a coherent state and, through resonant interaction with one or few two-level systems, it evolves into a coherently displaced Fock state without any postselection. We show the feasibility of the scheme under realistic parameters. The presented method opens a door to reach Fock states, with n∼100 and optimal fidelities above 70%, blurring the line between macroscopic and quantum states of the field.
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[9]

Deep learning-based classification of high intensity light patterns in photorefractive crystals

Marija Ivanović, Ana Mančić, Carla Hermann-Avigliano, Ljupčo Hadžievski and Aleksandra Maluckov

J. Opt. 22, 035504 (2020)

In this paper, we establish a new scheme for identification and classification of high intensity events generated by the propagation of light through a photorefractive SBN crystal. Among these events, which are the inevitable consequence of the development of modulation instability, are speckling and soliton-like patterns. The usual classifiers, developed on statistical measures, such as the significant intensity, often provide only a partial characterization of these events. Here, we try to overcome this deficiency by implementing the convolution neural network method to relate experimental data of light intensity distribution and corresponding numerical outputs with different high intensity regimes. The train and test sets are formed of experimentally obtained intensity profiles at the crystal output facet and corresponding numerical profiles. The accuracy of detection of speckles reaches maximum value of 100%, while the accuracy of solitons and caustic detection is above 97%. These performances are promising for the creation of neural network based routines for prediction of extreme events in wave media.
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[8]

Manipulation of multimode squeezing in a coupled waveguide array

S. Rojas-Rojas, E. Barriga, C. Muñoz, P. Solano, and C. Hermann-Avigliano

Phys. Rev. A 100, 023841 (2019)

We present a scheme for generating and manipulating three-mode squeezed states with genuine tripartite entanglement by injecting single-mode squeezed light into an array of coupled optical waveguides. We explore the possibility to selectively generate single-mode squeezing or multimode squeezing at the output of an elliptical waveguide array, determined solely by the input light polarization. We study the effect of losses in the waveguide array and show that quantum correlations and squeezing are preserved for realistic parameters. Our results show that arrays of optical waveguides are suitable platforms for generating multimode quantum light, which could lead to novel applications in quantum metrology.
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[7]

Spatial rogue waves in photorefractive SBN crystals

C. Hermann-Avigliano, I. A. Salinas, D. A. Rivas, B. Real, A. Mančić, C. Mejía-Cortés, A. Maluckov, and R. A. Vicencio

Opt. Lett. 44(11),  2807 (2019)

We report on the excitation of large-amplitude waves, with a probability of around 1% of total peaks, on a photorefractive SBN crystal by using a simple experimental setup at room temperature. We excite the system using a narrow Gaussian beam and observe different dynamical regimes tailored by the value and time rate of an applied voltage. We identify two main dynamical regimes: a caustic one for energy spreading and a speckling one for peak emergence. Our observations are well described by a two-dimensional Schrodinger model with saturable local nonlinearity.
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[6]

Observation of localized ground and excited orbitals in graphene photonic ribbons

C. Cantillano, S. Mukherjee, L. Morales-Inostroza, B. Real, G. Cáceres-Aravena, C. Hermann-Avigliano, R. R. Thomson and R. A. Vicencio

New J. Phys 20, 033028 (2018)

We report on the experimental realization of a quasi-one-dimensional photonic graphene ribbon supporting four flat-bands (FBs). We study the dynamics of fundamental and dipolar modes, which are analogous to the s and p orbitals, respectively. In the experiment, both modes (orbitals) are effectively decoupled from each other, implying two sets of six bands, where two of them are completely flat (dispersionless). Using an image generator setup, we excite the s and p FB modes and demonstrate their non-diffracting propagation for the first time. Our results open an exciting route towards photonic emulation of higher orbital dynamics.
Abstract
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[5]

Phase sensing beyond the standard quantum limit with a variation on the SU(1,1) interferometer

B. E. Anderson, P. Gupta, B. L. Schmittberger, T. Horrom, C. Hermann-Avigliano, K. M. Jones, and P. D. Lett

Optica 4(7), 752 (2017)

An SU(1,1) interferometer, which replaces the beam splitters in a Mach–Zehnder interferometer with nonlinear interactions, offers the potential of achieving improved phase sensitivity in applications with low optical powers. We present a novel variation on the SU(1,1) interferometer in which the second nonlinear interaction is replaced with balanced homodyne detection. We show theoretically that this “truncated SU(1,1) interferometer” can achieve the same potential phase sensitivity as the conventional SU(1,1) interferometer. We build an experimental realization of this device using seeded four-wave mixing in Rb85 vapor as the nonlinear interaction, thus employing a bright two-mode squeezed state as the phase-sensing quantum state inside the interferometer. Measurements as a function of operating point show that even with approx. 35% loss, this device can surpass the standard quantum limit by 4 dB. This device is simpler to build and operate than the conventional SU(1,1) interferometer, and also eliminates some sources of loss, thus making it useful for applications in precision metrology.
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[4]

Microwaves Probe Dipole Blockade and van der Waals Forces in a Cold Rydberg Gas

R. Celistrino Teixeira, C. Hermann-Avigliano, T. L. Nguyen, T. Cantat-Moltrecht, J.M. Raimond, S. Haroche, S. Gleyzes and M. Brune

Phys. Rev. Lett. 115, 013001 (2015)

We show that microwave spectroscopy of a dense Rydberg gas trapped on a superconducting atom chip in the dipole blockade regime reveals directly the dipole-dipole many-body interaction energy spectrum. We use this method to investigate the expansion of the Rydberg cloud under the effect of repulsive van der Waals forces and the breakdown of the frozen gas approximation. This study opens a promising route for quantum simulation of many-body systems and quantum information transport in chains of strongly interacting Rydberg atoms.
Abstract
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[3]

Scheme for efficient generation of mesoscopic field-state superposition in cavity QED

C. Hermann-Avigliano, N. Cisternas, M. Brune, J.-M. Raimond, and C. Saavedra

Phys. Rev. A 91, 013815 (2015)

We present a simple scheme for the fast and efficient generation of quantum superpositions of two coherent fields with different classical amplitudes in a cavity. It relies on the simultaneous interaction of two two-level systems with the field. Their final detection with a high probability in the proper state projects the field onto the desired mesoscopic field state superposition. We show that the scheme is notably more efficient than those using a single atom. We discuss the method in the context of microwave cavity quantum electrodynamics, but it is also highly relevant for the thriving field of circuit QED. It may lead to interesting experimental studies of decoherence at the quantum-classical boundary.
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[2]

Long coherence times for Rydberg qubits on a superconducting atom chip

C. Hermann-Avigliano, R. Celistrino Teixeira, T. L. Nguyen, T. Cantat-Moltrecht, G. Nogues, I. Dotsenko, S. Gleyzes, J.M. Raimond, S. Haroche, and M. Brune

Phys. Rev. A 90, 040502(R) (2014)

Superconducting atom chips and Rydberg atoms are promising tools for quantum information processing operations based on the dipole blockade effect. Nevertheless, one has to face the severe problem of stray electric fields in the vicinity of the chip. We demonstrate a simple method circumventing this problem. Microwave spectroscopy reveals extremely long coherence lifetimes (in the millisecond range) for a qubit stored in a Rydberg level superposition close to the chip surface. This is an essential step for the development of quantum simulations with Rydberg atoms and of a hybrid quantum information architecture based on atomic ensembles and superconducting circuits.
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[1]

Conclusive discrimination among N equidistant pure states

L. Roa, C. Hermann-Avigliano, R. Salazar, and A. B. Klimov

Phys. Rev. A 84, 014302 (2011)

We find the allowed complex overlaps for N equidistant pure quantum states. The accessible overlaps define a petal-shaped area on the Argand plane. Each point inside the petal represents a set of N linearly independent pure states and each point on its contour represents a set of N linearly dependent pure states. We find the optimal probabilities of success of discriminating unambiguously in which of the N equidistant states the system is. We show that the phase of the involved overlap plays an important role in the probability of success. For a fixed overlap modulus, the success probability is highest for the set of states with an overlap with phase equal to zero. In this case, if the process fails, then the information about the prepared state is lost. For states with a phase different from zero, the information could be obtained with an error-minimizing measurement protocol.
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