A5024796443- Quantum Information and Cryptography
- Quantum Mechanics and Applications
- Quantum Computing Algorithms and Architecture
- Neural Networks and Reservoir Computing
- Quantum Mechanics and Non-Hermitian Physics
- Quantum and electron transport phenomena
- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Optical Network Technologies
- Mechanical and Optical Resonators
- Topological Materials and Phenomena
- Quantum chaos and dynamical systems
- Advanced Thermodynamics and Statistical Mechanics
Beijing Computational Science Research Center
2019-2024
Southeast University
2019-2020
In the standard quantum theory, causal order of occurrence between events is prescribed, and must be definite. This has been maintained in all conventional scenarios operation for batteries. this study we take a step further to allow charging batteries an indefinite (ICO). We propose nonunitary dynamics-based protocol experimentally investigate using photonic switch. Our results demonstrate that both amount energy charged thermal efficiency can boosted simultaneously. Moreover, reveal...
Quantum measurements play a fundamental role in quantum mechanics. Especially, generalized provide powerful and versatile tool to extract information from systems. However, how realize them on an arbitrary higher-dimensional system remains challenging task. Here we propose simple recipe for the implementation of general positive-operator valued measurement (POVM) via one-dimensional discrete-time walk with two-dimensional coin. Furthermore, using single photons linear optics, experimentally...
Given that contextuality and coherence are significant resources in quantum physics, exploring the intricate interplay between these two factors presents a compelling avenue for research. Here, an experiment is presented to investigate nuanced relationship contextual robustness scenario of state discrimination. Specifically, types noises---depolarizing dephasing---are introduced measurement procedure assess contextuality. By varying overlap states be discriminated, we explore variations...
We experimentally realize a nonlinear quantum protocol for single-photon qubits with linear optical elements and appropriate measurements. Quantum nonlinearity is induced by postselecting the polarization qubit based on measurement result obtained spatial degree of freedom single photon which plays role second qubit. Initially, both are prepared in same state an two-qubit unitary transformation entangles them before part. analyze tomography freedom. then demonstrate usefulness discrimination...
We experimentally demonstrate a method for detection of entanglement via construction witnesses from limited fixed set local measurements ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="m1"> <mml:mrow> <mml:mi mathvariant="script">M</mml:mi> </mml:mrow> </mml:math> ). Such does not require priori knowledge about the form witnesses. It is suitable scenario where full state tomography available, but only resource id="m2"> . on pure two-qubit entangled states and...
The authors report experimental studies of conditional uncertainty relations in terms majorization the presence quantum memory. They also demonstrate an application relation witnessing steerability.
Quantum walks, a counterpart of classical random have many applications due to their neoteric features. Since they were first proposed, quantum walks been explored in fields theoretically and also demonstrated experimentally various physical systems. In this paper, we review the experimental realizations discrete-time photonic systems with different structures, such as bulk optics time-multiplexed framework. Then, some typical using are introduced. Finally, advantages disadvantages these discussed.
ABSTRACT The physical process in the macroscopic world unfolds along a single time direction, while evolution of quantum system is reversible principle. How to recover its past state complex issue both fundamental and practical interests. In this article, we experimentally demonstrate novel method for recovering walks (QWs), also known as full-state revival. Moreover, observe two other important phenomena QWs, recurrence periodicity, via simplifying repeatedly implementing scheme,...
Abstract Iterated quantum protocols with measurement-based selection lead to deterministic chaos for the evolving pure state representing an ensemble of qubits. Deterministic may ergodic evolution in sense that initial states from any small area on Bloch sphere will cover whole after a finite number iterations. We realize two steps protocol photonic experiment, where qubit are encoded polarization and path degrees freedom down-converted photons stemming parametric process. numerically...
We experimentally investigate how initial entanglement between the system and environment can be detected in an open by using some prior knowledge of joint evolutions. The protocol we employed requires classical optimization on results after performing measurements state. Such approach does not require a full 2-qubit QST, works scenarios where one has access to only. demonstrate both pure entangled states mixed states. obtained show experimental accessibility validity protocol. Compared with...
Abstract The Clauser–Horne–Shimony–Holt (CHSH) inequality test is widely used as a mean of invalidating the local deterministic theories. Most attempts to experimentally nonlocality have presumed unphysical idealizations that do not hold in real experiments, namely, noiseless measurements. We demonstrate an experimental violation CHSH free idealization and rules out models with high confidence. show can always be violated for any nonzero noise parameter measurement. Intriguingly, less...