Article
Quantum Science & Technology
Xuanhua Wang, Jin Wang
Summary: In this study, quantum master equations beyond secular approximation are used to study the nonequilibrium thermodynamic cost of enhanced quantum metrology and quantum correlations. It is found that nonequilibrium conditions enhance quantum Fisher information and quantum correlations predominantly for weak tunneling scenarios. However, in the strong tunneling regimes, the quantum Fisher information and quantum correlations cannot be continuously boosted by higher thermodynamic costs and decay once the system is overburdened with extremely large energy currents.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Multidisciplinary Sciences
Hsuan-Hao Lu, Karthik Myilswamy, Ryan S. Bennink, Suparna Seshadri, Mohammed S. Alshaykh, Junqiu Liu, Tobias J. Kippenberg, Daniel E. Leaird, Andrew M. Weiner, Joseph M. Lukens
Summary: With the development of integrated biphoton frequency combs, quantum information processing in the frequency domain has attracted more attention in recent years. To address the scalability issue of frequency mixing operations, the authors propose a novel solution that utilizes pulse shapers and electro-optic phase modulators to perform random operations. They successfully verify the entanglement and reconstruct the full density matrix of biphoton frequency combs, achieving the highest dimension for frequency bins to date. The employed Bayesian statistical model can be tailored to various quantum systems with restricted measurement capabilities, providing an opportunistic tomographic framework.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
L. S. Lima
Summary: The entanglement of magnons in the nearest-neighbor Heisenberg model on Lieb lattice with out-of-plane Dzyaloshinskii-Moriya antisymmetric spin coupling and external magnetic field is studied, analyzing the impact of magnon bands on quantum entanglement. Furthermore, quantum correlations in some fermions models such as the two-dimensional non-Hermitian model on LL lattice and the tight-binding model on the LL lattice have been analyzed, where the opening of the gap in the spectrum affects entanglement quantifiers.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Engineering, Electrical & Electronic
Ruiqing Xu, Ri-Gui Zhou, Yaochong Li
Summary: Quantum mechanics allows information to travel through multiple communication channels simultaneously, resulting in quantum trajectories where the causal order of communication channels becomes indefinite. The distribution of entanglement over quantum trajectories has been shown to enable noiseless quantum teleportation, which is not achievable in classical trajectories. This study explores the potential advantage of quantum trajectories in generating link-level entanglement for quantum networks, analyzes the performance of entanglement distribution over multiple quantum trajectories, and examines the application of entanglement purification protocol to reduce noise in link-level entanglement.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2023)
Article
Business, Finance
Yang Liu, Mengying Cui, Xubin Gao
Summary: In the investment linkage, there are differences in risk preference and interest distribution between investment institutions and commercial banks. Therefore, the strategic choice of whether to carry out investment and loan linkage differs between the two sides. Currently, investment linkage has not been effectively promoted in China. This paper aims to provide policy suggestions for encouraging third-party investment institutions and commercial banks to carry out investment and loan linkage through the perspective of quantum game.
FINANCE RESEARCH LETTERS
(2023)
Article
Physics, Multidisciplinary
Leizhen Chen, Liangliang Lu, Lijun Xia, Yanqing Lu, Shining Zhu, Xiao-song Ma
Summary: Integrated quantum photonics is a rapidly developing field that allows for the generation, manipulation, and detection of entangled photons. Multipartite entangled states, such as the Dicke states, are essential for scalable quantum information processing. In this study, we demonstrate the generation and coherent control of four-photon Dicke states using a silicon photonic chip. The generated photons are in the telecom band, making them suitable for large-scale photonic quantum technologies for multiparty networking and metrology.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Duan-Cheng Liu, Pei-Yun Li, Tian -Xiang Zhu, Liang Zheng, Jian-Yin Huang, Zong-Quan Zhou, Chuan-Feng Li, Guang-Can Guo
Summary: This study demonstrates the storage and on-demand retrieval of quantum memories at telecom wavelengths, which is crucial for the establishment of large-scale quantum networks based on fiber networks. The designed storage device features high reliability and scalability, and can be directly integrated into fiber networks.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Rocco Duquennoy, Maja Colautti, Ramin Emadi, Prosenjit Majumder, Pietro Lombardi, Costanza Toninelli
Summary: Scalability and miniaturization are features of solid-state platforms for photonic quantum technologies, but achieving two-photon interference from distinct emitters on a chip remains a challenge. Molecular single-photon sources provide a promising platform for quantum interference experiments by tuning the emission frequency.
Article
Optics
Alessandro Ferreri, Hannes Pfeifer, Frank K. Wilhelm, Sebastian Hofferberth, David Edward Bruschi
Summary: In this study, we develop a model to simulate the quantum phenomena of a quantum field confined by a movable wall. The model provides a detailed description of the dynamics of the quantum field and the confining wall, taking into account their interaction with external driving forces. The model successfully reproduces the resonant cavity mode stimulation caused by the mirror's periodic motion (dynamical Casimir effect), as well as the standard radiation pressure effects on the quantized wall (optomechanics), and considers the interplay between the two scenarios.
Article
Quantum Science & Technology
Si-Yu Guan, Hong-Fu Wang, Xuexi Yi
Summary: We propose a method to generate and control strong entanglement between photon and magnon modes by utilizing the cooperative effect of coherent coupling and dissipative coupling. This cooperative effect leads to the appearance of two exceptional points (EPs), where particularly obvious quantum entanglement and perfect one-way steering can be achieved.
NPJ QUANTUM INFORMATION
(2022)
Article
Quantum Science & Technology
Nan Yang, Jiaji Wu, Xianyun Dong, Longyu Xiao, Jing Wang, Ming Li
Summary: We propose a new entanglement measure based on the optimal entanglement witness. This measure satisfies necessary properties, including zero entanglement for separable states, convexity, continuity, invariance under local unitary operations, and non-increase under LOCC. We provide a mathematical expression for the lower bound of this measure for any bipartite mixed states and improve the bound for 2×2 systems. Numerical simulations are conducted to evaluate the lower bound for specific quantum states.
QUANTUM INFORMATION PROCESSING
(2023)
Article
Quantum Science & Technology
Yu-Min Guo, Yi Shen, Li-Jun Zhao, Lin Chen, Mengyao Hu, Zhiwei Wei, Shao-Ming Fei
Summary: Quantum catalytic transformations are crucial in converting quantum entangled states under local operations and classical communications (LOCC). The key issues lie in the existence and limits of catalytic states, with necessary conditions based on the Schmidt coefficients of entangled source and target states. Investigation into lower bounds on dimensions of catalytic states is conducted, along with a detailed protocol for quantum mixed state transformation under entanglement-assisted LOCC.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Physics, Multidisciplinary
Kun-Jie Zhou, Jian Zou, Bao-Ming Xu, Lei Li, Bin Shao
Summary: The study shows that non-Markovianity delays the occurrence of anti-synchronization and reduces the parameter region for anti-synchronization between two qubits interacting with a common environment. The definitions of nu, entanglement, and quantum mutual information are established in both Markovian and non-Markovian regimes when the environment is in a vacuum state. Increasing temperature leads to a convergence of the parameter regions and times for anti-synchronization between the two regimes. High temperature decreases the parameter region for anti-synchronization and disrupts the relationship among nu, entanglement, and quantum mutual information in both Markovian and non-Markovian regimes.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2021)
Article
Optics
Danilo Zia, Nazanin Dehghan, Alessio D'Errico, Fabio Sciarrino, Ebrahim Karimi
Summary: Biphoton digital holography is a method that uses coincidence imaging to retrieve amplitude and phase information of an unknown biphoton state. This approach allows for a more efficient and reliable characterization of high-dimensional biphoton states. The proposed reconstruction technique achieves a three orders of magnitude faster measurement time and an average fidelity of 87% compared to previous experiments.
Article
Quantum Science & Technology
Fatima-Zahra Siyouri, Hicham Amellal, Yassine Hassouni
Summary: We discuss the dynamics of quantum dissonance, quantum discord, and entanglement for bipartite Bell-diagonal states interacting with dephasing reservoirs. The sensitivity of these quantum correlations to the environment effect increases with the independent random variable. Dissonance is more robust to decoherence than other quantum correlations, indicating its potential to fully explain the system's quantum characteristics under the environment effect.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Optics
Leili Esmaeilifar, Timothy C. Ralph
Summary: The use of a nonlinear optical interferometer for estimating local gravitational acceleration is investigated. A Mach-Zehnder interferometer (MZI) in an optical fountain configuration with a Kerr nonlinear medium in the arms is studied. This configuration allows parameter estimation beyond the standard Heisenberg limit of a linear interferometer. Compared to previous studies, it is argued that this interferometer configuration is better posed and achieves improved precision for similar scale and pump powers.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
Article
Optics
Dmitry A. Chermoshentsev, Artem E. Shitikov, Evgeny A. Lonshakov, Georgy Grechko, Ekaterina A. Sazhina, Nikita M. Kondratiev, Anatoly Masalov, Igor A. Bilenko, Alexander Lvovsky, Alexander E. Ulanov
Summary: In this study, we experimentally demonstrate the dual-laser self-injection locking (SIL) of two multifrequency laser diodes to different modes of an integrated microresonator. The simultaneous spectrum collapse of both lasers, as well as the narrowing of linewidth and suppression of high-frequency noise, are observed. The strong nonlinear interaction between the two fields is also observed. Locking both lasers to the same mode results in simultaneous frequency and phase stabilization and coherent addition of their outputs. Additionally, a comprehensive dual-SIL theory is provided, and the influence of lasers on each other caused by nonlinear effects in the microresonator is investigated.
Article
Physics, Multidisciplinary
Joshua J. Guanzon, Matthew S. Winnel, Austin P. Lund, Timothy C. Ralph
Summary: We introduce a linear optical technique that can achieve ideal quantum teleamplification, improving success probability and resource efficiency. We also demonstrate its applications as a loss-tolerant quantum relay for entanglement distribution and distillation.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Sergei Slussarenko, Morgan M. Weston, Lynden K. Shalm, Varun B. Verma, Sae-Woo Nam, Sacha Kocsis, Timothy C. Ralph, Geoff J. Pryde
Summary: This study demonstrates successful channel correction for long-distance quantum communication, improving the transmission performance of entangled channels without relying on post-processing or post-selection of data.
NATURE COMMUNICATIONS
(2022)
Article
Astronomy & Astrophysics
Lachlan G. Bishop, Timothy C. Ralph, Fabio Costa
Summary: Past studies on the billiard-ball paradox have focused on classical histories, while this study develops a quantum version using a quantum circuit to describe various paths. The model finds self-consistent solutions using Deutsch's prescription and pure-state solutions using the postselected teleportation prescription. The study also discusses methods for ensuring convergence in the continuum limit.
CLASSICAL AND QUANTUM GRAVITY
(2022)
Article
Physics, Multidisciplinary
James Q. Quach, Timothy C. Ralph, William J. Munro
Summary: This study explores the geometric phase resulting from timelike entanglement between future and past, showing that it can be captured in a simple A system. It provides an alternative paradigm to the Unruh-deWitt detector.
PHYSICAL REVIEW LETTERS
(2022)
Article
Quantum Science & Technology
Matthew S. Winnel, Joshua J. Guanzon, Nedasadat Hosseinidehaj, Timothy C. Ralph
Summary: This study proposes a practical design for achieving the ultimate end-to-end rates of quantum communication networks through an iterative approach and entanglement distillation protocol. An experimental implementation using linear optics and photon-number measurements is also proposed.
NPJ QUANTUM INFORMATION
(2022)
Article
Optics
Wanli Xing, T. C. Ralph
Summary: We have derived analytical solutions for the Heisenberg evolution under the trilinear parametric Hamiltonian, which are accurate up to second order in the interaction strength and valid for all pump amplitudes. These solutions enable the incorporation of pump depletion effects in the description of optical parametric amplification in experimentally relevant scenarios and provide a rigorous description of the resulting phenomena.
Article
Optics
Caroline Mauron, Timothy C. Ralph
Summary: We analyze and compare three quantum communication protocols proposed in the literature for their ability to transmit single-rail entanglement. Specific metrics are used to measure output-state purity and probability of success, taking into account the imperfections of photon source and detection components. Our findings suggest that, under most conditions, a distributed noiseless linear amplification (NLA) protocol with a relay point placed halfway between Alice and Bob outperforms NLA at Bob's end and a recently proposed purification protocol, unless the distance is very small or the photon source component is of high quality.
Article
Physics, Multidisciplinary
N. V. Rudavin, I. S. Gerasin, E. E. Mekhtiev, A. V. Duplinsky, Y. V. Kurochkin
Summary: In this paper, an algorithm for automatically adjusting the frequency synthesizers of the transmitter and receiver nodes in commercial fiber quantum key distribution systems is proposed. The frequency mismatch, caused by temperature fluctuations, mechanical effects, and imperfections in the technological processes, can be mitigated by the algorithm. After optimizing the algorithm parameters, it was tested on optical lines of different lengths.
ST PETERSBURG POLYTECHNIC UNIVERSITY JOURNAL-PHYSICS AND MATHEMATICS
(2022)
Article
Optics
Josephine Dias, Matthew S. Winnel, William J. Munro, T. C. Ralph, Kae Nemoto
Summary: This study presents a method of using a discrete-variable repeater protocol to distribute continuous-variable states and compares the rates of continuous-variable entanglement distribution between first-generation continuous- and discrete-variable quantum repeaters.
Article
Astronomy & Astrophysics
Sho Onoe, Thiago L. M. Guedes, Andrey S. Moskalenko, Alfred Leitenstorfer, Guido Burkard, Timothy C. Ralph
Summary: A new theoretical framework is proposed to describe the experimental advances in electro-optic detection of broadband quantum states. By utilizing concepts from quantum field theory, the nonlinear interaction behind the electro-optic effect is shown to be equivalent to a Unruh-DeWitt detector coupled to a conjugate field. The analysis accurately captures the quantum nature of the vacuum and proposes a specific working regime to experimentally verify the existence of virtual photons with quantum correlations in the electromagnetic ground state.
Article
Optics
Joshua Foo, Sho Onoe, Magdalena Zych, Timothy C. Ralph
Summary: This article presents theoretical models for quantum-optical mode-selective filters and mirrors using continuous-variable teleportation. These devices, known as telefilters and telemirrors, can act as identity channels for specific modes while filtering or reflecting all other modes. The models are used to analyze causality problems in relativistic quantum optics, particularly the transmission and propagation of delocalized wave packets through mode-selective mirrors. The research demonstrates the importance of time delay and considers the discrimination and selection of different modes.
Article
Computer Science, Artificial Intelligence
Thomas D. Barrett, Aleksei Malyshev, A. Lvovsky
Summary: In quantum chemistry systems, accurate and scalable methods are needed for electronic structure calculations. Researchers have used an autoregressive neural network approach to study larger molecules, and found that it can outperform conventional methods even in the presence of strong quantum correlations. The method allows for highly efficient and scalable sampling.
NATURE MACHINE INTELLIGENCE
(2022)
Article
Optics
Nedasadat Hosseinidehaj, Matthew S. Winnel, Timothy C. Ralph
Summary: The continuous-variable quantum key distribution protocol discussed in the text utilizes a bright laser for modulation and self-homodyne detection, resulting in a simpler and more robust approach compared to traditional methods. By properly modulating the squeezed laser and making certain assumptions, the protocol can eliminate information leakage to eavesdroppers and increase tolerance to loss.
