Article
Physics, Multidisciplinary
Francesco Albarelli, Mateusz Mazelanik, Michal Lipka, Alexander Streltsov, Michal Parniak, Rafal Demkowicz-Dobrzanski
Summary: This article introduces quantum asymmetry and its relationship with coherence, emphasizing the counterintuitive phenomenon where asymmetry may increase with a decrease in coherence. Through a photon interferometric experiment, the authors intuitively explain and demonstrate this phenomenon. They also discuss the impact of this effect in transitioning from the quantum level to the classical regime and establish an analogy in the case of entanglement resource theory.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Bruno Coelho Coutinho, William John Munro, Kae Nemoto, Yasser Omar
Summary: Researchers investigated the robustness of quantum networks for entanglement distribution using a modified version of Bernoulli-percolation theory. They found that quantum networks based on noisy quantum-repeater nodes are prone to discontinuous phase transitions and limit their operational range.
COMMUNICATIONS PHYSICS
(2022)
Article
Quantum Science & Technology
Beata Zjawin, David Schmid, Matty J. Hoban, Ana Belen Sainz
Summary: Einstein-Podolsky-Rosen (EPR) steering can be explained by Alice updating her knowledge of Bob's system through measurements on a correlated system, rather than having a causal influence on Bob's system. We propose a resource-theoretic treatment of correlations in EPR scenarios, where local operations and shared randomness (LOSR) are considered as free operations. We show that resource conversion under free operations can be solved using a single instance of a semidefinite program, and we find interesting properties in the pre-order structure of resources.
Article
Optics
Wen Zhao, Xueshi Guo, Xiaoying Li
Summary: A pulsed pumped four-wave mixing process in an optical fiber can generate optical pulses with continuous variable quantum correlation via chi(3) non-linearity. However, the pairwise correlation of the generated pulses in this system has not been demonstrated.
Article
Multidisciplinary Sciences
Alessia Allevi, Maria Bondani
Summary: This study proposes a novel communication protocol based on TWB states of light, which allows for successful decryption of messages even in the presence of eavesdropping attacks.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Multidisciplinary
Sooryansh Asthana
Summary: In this paper, the authors demonstrate that the coherence witness for a single qubit can provide conditions for nonlocality and entanglement inequalities in multiqubit systems, as well as a condition for quantum discord in two-qubit systems. They use homomorphism among stabilizer groups to show these results. The paper also discusses the generalization of CHSH inequality to multiqubit GHZ states and emphasizes the importance of gaining better control over multiple degrees of freedom and multi-party systems.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Yue Zhang, Shunlong Luo
Summary: The article introduces a method to quantify the nonclassicality of multimode bosonic field states using an information-theoretic approach, and illustrates the fundamental properties and some applications of this quantifier. Various extensions are also mentioned for further exploration.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2021)
Article
Physics, Multidisciplinary
Karl Pelka, Guilhem Madiot, Remy Braive, Andre Xuereb
Summary: Cavity optomechanical systems enable the manipulation of mechanical degrees of freedom with light. In this study, we demonstrate that temporally modulated driving can steer mechanical modes and induce transitions between different steady states. Our results also reveal the additional influence of thermo-optic nonlinearity on system dynamics.
PHYSICAL REVIEW LETTERS
(2022)
Article
Quantum Science & Technology
Ashok Kumar, Gaurav Nirala, Alberto M. Marino
Summary: Research demonstrates the presence of EPR spatial entanglement in bright twin beams, and imaging of the beams shows spatial squeezing, pointing towards the presence of hyperentanglement.
QUANTUM SCIENCE AND TECHNOLOGY
(2021)
Article
Optics
Anaelle Hertz, Stephan De Bievre
Summary: Photon addition and subtraction can transform Gaussian states into non-Gaussian states. We quantitatively analyze the change in nonclassicality by examining the Wigner negativity and quadrature coherence scale (QCS) of the resulting states. The QCS, a recently introduced measure of nonclassicality, increases relative to photon addition and subtraction, with a maximum increase of 200%. This implies that the process of degaussification and the associated increase in nonclassicality come at a cost of increased susceptibility to environmental decoherence. Our results are based on explicit and general expressions for the characteristic and Wigner functions of photon-added and-subtracted single-and multimode Gaussian states, for which we provide a simple derivation. These expressions also allow us to confirm the quantum non-Gaussianity of photon-subtracted states with positive Wigner functions.
Article
Optics
Konrad Schlichtholz, Bianka Woloncewicz, Marek Zukowski
Summary: This study focuses on bright emissions involving higher-order emissions of Greenberger-Horne-Zeilinger-entangled photons, which serve as a natural generalization of the squeezed vacuum. By using Pade approximation to overcome technical difficulties, the researchers are able to study the nonclassicality of the new bright generalized states. Violations of local realism and tailored entanglement indicators for this case are presented in the study.
Article
Optics
Kaushiki Mukherjee, Indranil Chakrabarty, Ganesh Mylavarapu
Summary: This article investigates the non-n-local features of quantum network correlations in a noisy network scenario and introduces the concept of persistency of non-n-locality to analyze the decay of network correlations with increasing length of the linear network in the presence of imperfections.
Article
Chemistry, Physical
Frank Schlawin, Konstantin E. Dorfman, Shaul Mukamel
Summary: The study proposes using nonlinear optical signals for the characterization of quantum light. Raman measurements serve as an alternative direct probe for a different component of the four-point correlation function underlying the g((2))-function. This work demonstrates how controlled optical nonlinear processes can offer an alternative perspective on analyzing quantum light sources.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Optics
Ayan Patra, Rivu Gupta, Saptarshi Roy, Tamoghna Das, Aditi Sen(De)
Summary: This study introduces a framework of a multimode dense coding network for communication between multiple senders and a single receiver using continuous variable systems. The research shows that the dense coding capacity increases with the amount of energy transmitted from the senders to the receiver, demonstrating the quantum advantage of the protocol.
Article
Quantum Science & Technology
Shahaf Asban, F. Javier Garcia de Abajo
Summary: The study combines quantum information theory with free electron sources to investigate the interactions of free electrons propagating near the surface of a polariton-supporting medium and the entanglement induced by pair-wise coupling. The experiment reveals that long interaction times of broadband electrons can extend their temporal coherence, resulting in an extended Hong-Ou-Mandel peak and increased entanglement entropy.
NPJ QUANTUM INFORMATION
(2021)
Article
Physics, Multidisciplinary
Artur Barasinski, Jan Perina Jr, Antonin Cernoch
Summary: Identification and quantification of quantum correlations are crucial for understanding and manipulating quantum devices and processes. We have developed and implemented a general method to quantify different forms of quantum correlations using experimental intensity moments up to the fourth order. These moments allow for the precise determination of global and marginal impurities of two-beam Gaussian fields, enabling the assessment of steering, tight lower and upper bounds for negativity, and the use of Kullback-Leibler divergence as a quantifier for nonseparability. The method has been successfully demonstrated on experimental twin beams and squeezed super-Gaussian beams. It can be readily applied to characterize quantum correlations in multibeam Gaussian fields.
PHYSICAL REVIEW LETTERS
(2023)
Article
Quantum Science & Technology
Jan Perina, Adam Miranowicz, Grzegorz Chimczak, Anna Kowalewska-Kudtaszyk
Summary: This paper discusses equivalent approaches to determine the eigenfrequencies of the Liouvillians of open quantum systems using the solution of the Heisenberg-Langevin equations and the corresponding equations for operator moments. The equivalence of both approaches is demonstrated by analyzing a simple damped two-level atom. The presented approach via the Heisenberg-Langevin equations reveals the structure and eigenfrequencies of quantum exceptional and diabolical points.
Article
Physics, Multidisciplinary
Alberto Mercurio, Shilan Abo, Fabio Mauceri, Enrico Russo, Vincenzo Macri, Adam Miranowicz, Salvatore Savasta, Omar Di Stefano
Summary: Pure dephasing is important for both spectroscopy and quantum information technology, and often leads to decay of quantum correlations. We investigate how pure dephasing of one component of a hybrid quantum system affects the dephasing rate of system transitions. We find that the interaction in a light-matter system significantly affects the stochastic perturbation describing the dephasing of a subsystem, depending on the gauge adopted.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Ievgen I. I. Arkhipov, Adam Miranowicz, Fabrizio Minganti, Sahin K. Ozdemir, Franco Nori
Summary: Nontrivial spectral properties of non-Hermitian systems can lead to intriguing effects, such as controlled asymmetric-symmetric mode switching in a two-mode photonic system by dynamically winding around an exceptional point (EP). However, for multimode systems with higher-order EPs or multiple low-order EPs, controlling asymmetric-symmetric mode switching can be impeded due to the breakdown of adiabaticity. In this work, we demonstrate that this difficulty can be overcome by winding around exceptional curves by additionally crossing diabolic points. Our findings provide alternative routes for light manipulations in non-Hermitian photonic setups.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Shilan Abo, Jan Soubusta, Katerina Jirakova, Karol Bartkiewicz, Antonin Cernoch, Karel Lemr, Adam Miranowicz
Summary: We experimentally demonstrate a hierarchy of quantum entanglement, steering, and Bell nonlocality by measuring only six elements of a correlation matrix depending on linear combinations of two-qubit Stokes parameters. Our experimental setup also reveals the hierarchy of quantum correlations of generalized Werner states, which are any two-qubit pure states affected by white noise.
SCIENTIFIC REPORTS
(2023)
Article
Optics
Mariusz Drong, Jan Perina, Tibor Fordos, Henri Y. Jaffres, Kamil Postava, Henri-Jean Drouhin
Summary: It is found that spin-injected vertical-cavity surface-emitting lasers (spin-VCSELs) exhibit interesting functionalities when considering the linear gain anisotropy. Using the extended spin-flip model (SFM), exceptional points (EPs) are predicted in spin-VCSELs along with two interesting phenomena: polarization switching and frequency comb generation. These effects have great technological potential and are not limited to spin-VCSEL technology. The concept of anisotropy-engineered non-Hermitian microlasers and their polarization dynamics near EPs are discussed.
Article
Physics, Multidisciplinary
Kuan-Yi Lee, Jhen-Dong Lin, Adam Miranowicz, Franco Nori, Huan-Yu Ku, Yueh-Nan Chen
Summary: Quantum steering is a significant correlation in quantum information theory and has been found to be useful for quantum metrology. This study extends the exploration of steering-enhanced quantum metrology from single noiseless phase shifts to superpositions of noisy phase shifts. Experimental results demonstrate that utilizing superpositions of noisy phase shifts can effectively suppress noise effects and improve metrology.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Ievgen I. Arkhipov, Adam Miranowicz, Franco Nori, Sahin K. Ozdemir, Fabrizio Minganti
Summary: Finite simplex lattice models have various practical applications in different scientific fields. This study demonstrates the construction of solvable non-Hermitian n-simplex lattice models by reducing the high-order field-moments space of quadratic bosonic systems. These models provide a versatile platform for simulating non-Hermitian phenomena in real-space and gaining insights into complex many-body systems.
PHYSICAL REVIEW RESEARCH
(2023)
Proceedings Paper
Optics
Kishore Thapliyal, Jan Perina
Summary: This article systematically analyzes the generation of Stokes-anti-Stokes photon pairs in Raman scattering and provides suitable conditions for photon pair generation. In addition to the Raman active material properties and pump power, non-zero mean phonon number and losses in the phonon mode are also relevant parameters. Raman active materials with stronger anti-Stokes coupling are suitable for photon pair generation, even for non-zero thermal phonons as long as phonon losses are negligible.
22ND POLISH-SLOVAK-CZECH OPTICAL CONFERENCE ON WAVE AND QUANTUM ASPECTS OF CONTEMPORARY OPTICS
(2022)
Article
Physics, Multidisciplinary
Deng-Gao Lai, Ye-Hong Chen, Wei Qin, Adam Miranowicz, Franco Nori
Summary: We propose a method to generate tripartite light-vibration entanglement by controlling an optical dark mode. The study shows that quantum entanglement is significantly enhanced in the ODM-breaking regime.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
Ying Li, Ya-Feng Jiao, Jing-Xue Liu, Adam Miranowicz, Yun-Lan Zuo, Le-Man Kuang, Hui Jing
Summary: This research proposes a method to achieve a coherent switch of optomechanical entanglement using polarized light. By tuning the polarizations of the driving field, the optomechanical coupling can be controlled, enabling the coherent switching of quantum entanglement.
Article
Optics
Rui Xu, Deng-Gao Lai, Bang -Pin Hou, Adam Miranowicz, Franco Nori
Summary: This study proposes a method to achieve simultaneous ground-state refrigeration of multiple vibrational modes and improve cooling performance by introducing an auxiliary mechanical coupling. The amplification of the net-refrigeration rates by more than six orders of magnitude is observed when the auxiliary mechanical coupling is turned on. The research also reveals the relation between simultaneous ground-state cooling and auxiliary mechanical coupling.
Article
Physics, Multidisciplinary
Deng-Gao Lai, Wei Qin, Adam Miranowicz, Franco Nori
Summary: This paper proposes a method to achieve simultaneous ground-state refrigeration of two vibrational modes using an auxiliary feedback loop. The introduction of the auxiliary feedback loop enhances the mechanical susceptibilities and refrigeration rates. The paper also shows that the simultaneous ground-state refrigeration is achieved through the auxiliary feedback loop mechanism.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Quantum Science & Technology
Huan-Yu Ku, Josef Kadlec, Antonin Cernoch, Marco Tulio Quintino, Wenbin Zhou, Karel Lemr, Neill Lambert, Adam Miranowicz, Shin-Liang Chen, Franco Nori, Yueh-Nan Chen
Summary: This article investigates the relationship between breaking quantum channels and complementary tests of macrorealism. It introduces a hierarchy of nonbreaking channels and provides experimental evidence to support the proposed concepts.
Article
Physics, Multidisciplinary
Chia-Yi Ju, Adam Miranowicz, Fabrizio Minganti, Chuan-Tsung Chan, Guang-Yin Chen, Franco Nori
Summary: We present a systematic study on the vielbein-like formalism for non-Hermitian quantum systems, which transforms the Hilbert space bundles into conventional ones, making the induced Hamiltonian Hermitian without altering the physics.
PHYSICAL REVIEW RESEARCH
(2022)
