A unified theory is given of dynamically modified decay and decoherence of field-driven multilevel multipartite entangled states that are weakly coupled to zero-temperature baths or undergo random phase fluctuations. The theory allows for arbitrary local differences in their coupling to the environment. Due to such differences, the optimal driving-field modulation to ensure maximal fidelity is found to substantially differ from conventional ``Bang-Bang'' or $π$-phase flips of the single-qubit evolution.
Quantifying multilevel coherence and multipartite correlation based on $α$-affinity
Hebei GEO University(河北地质大学);Intelligent Sensor Network Engineering Research Center of Hebei Province, Hebei GEO University(河北省智能传感网络工程研究中心);School of Mathematics and Statistics, Shangqiu Normal University(商丘师范学院数学与统计学院)
Characterizing genuine quantum resources and determining operational rules for their manipulation are crucial steps to appraise possibilities and limitations of quantum technologies. Two such key resources are nonclassicality, manifested as quantum superposition between reference states of a single system, and entanglement, capturing quantum correlations among two or more subsystems. Here we present a general formalism for the conversion of nonclassicality into multipartite entanglement, showing that a faithful reversible transformation between the two resources is always possible within a pre…
In this paper, we investigate the dynamics behaviors of genuine multipartite Einstein-Podolsky-Rosen steering (GMS) and genuine multipartite nonlocality (GMN), and explore how to recover the lost GMS and GMN under a mixed decoherence system. Explicitly, the decoherence system can be modeled by that a tripartite Werner-type state suffers from the non-Markovian regimes and one subsystem of the tripartite is under a non-inertial frame. The conditions for steerable and nonlocal states can be obtained with respect to the tripartite Werner-type state established initially. GMS and GMN are very fragi…
Decoherence-free subspaces and Markovian revival of genuine multipartite entanglement in a dissipative system
Poornaprajna Institute of Scientific Research (PPISR)(普尔纳普拉吉纳科学研究学院);Manipal Academy of Higher Education(马帕尔高等教育学院);Amrita Vishwa Vidyapeetham(阿弥塔大学);National Institute for Theoretical and Computational Sciences (NITheCS)(理论与计算科学国家研究所);Chennai Institute of Technology(金奈理工学院)
Local quantum uncertainty (LQU) and local quantum Fisher information (LQFI) are both two tools used to capture purely quantum correlations in multi-partite quantum systems. In this paper, we study these quantifiers in the case of multipartite Glauber coherent state which include the GHZ (Greenberger-Horne-Zeilinger) and Werner states. We perform a comparative study between LQFI and LQU in an isolated system. Besides, by using the Kraus operator representation, we study the behavior of these quantifiers on the dephasing channel to investigate their performances under the decoherence effect. In …
Decoherence Mitigation with Local NOT Gates in Multipartite Systems
Qdit Labs Pvt. Ltd.(Qdit Labs有限公司);Indian Institute of Technology Hyderabad(印度理工学院海德拉巴分校);Poornaprajna Institute of Scientific Research(普尔纳普拉贾科学研究学院);University of Calgary(卡尔加里大学)
Certain quantum states are well-known to be particularly fragile in the presence of decoherence, as illustrated by Schrodinger's famous gedanken cat experiment. It has been better appreciated more recently that quantum states can be characterized in a hierarchy of quantum quantities such entanglement, quantum correlations, and quantum coherence. It has been conjectured that each of these quantities have various degrees of fragility in the presence of decoherence. Here we experimentally confirm this conjecture by preparing tripartite photonic states and subjecting them to controlled amounts of …
Local operations assisted by classical communication (LOCC) constitute the free operations in entanglement theory. Hence, the determination of LOCC transformations is crucial for the understanding of entanglement. We characterize here almost all LOCC transformations among pure multipartite multilevel states. Combined with the analogous results for qubit states shown by Gour \emph{et al.} [J. Math. Phys. 58, 092204 (2017)], this gives a characterization of almost all local transformations among multipartite pure states. We show that nontrivial LOCC transformations among generic, fully entangled…
The distribution of high-quality Greenberger-Horne-Zeilinger (GHZ) states is at the heart of many quantum communication tasks, ranging from extending the baseline of telescopes to secret sharing. They also play an important role in error-correction architectures for distributed quantum computation, where Bell pairs can be leveraged to create an entangled network of quantum computers. We investigate the creation and distillation of GHZ states out of non-perfect Bell pairs over quantum networks. In particular, we introduce a heuristic dynamic programming algorithm to optimize over a large class …
We have computed the global quantum discord and von Neumann entropy of multipartite two-level atomic systems interacting with a single-mode Fock field. We use Tavis-Cumming model. We have explored how quantum correlations and quantum entanglement evolve with time in such systems. The quantum system is prepared initially in a mixed state and different parameters are varied to see how they affect the information processing in the system. The dynamical character of the global quantum discord and von Neumann entropy show an interplay between classical and non-classical correlations. Photons in thi…
Intelligent Control of Collisional Architectures for Deterministic Multipartite State Engineering
KT One;Tokyo International University(东京国际大学);University of South Florida(南佛罗里达大学);Department of Physics, Koç University(科奇大学物理系);TÜBİTAK Research Institute for Fundamental Sciences (TBAE)(土耳其科学技术研究委员会基础科学研究院(TBAE));Nanoelectronics Research Center(纳米电子学研究中心)
Zero-field dipolar decoupling of color center ensembles via universal qutrit control
Universidad de Murcia(穆尔西亚大学);Monodon, Navantia, S.A(Navantia公司Monodon部门);Universidad Politécnica de Cartagena(卡塔赫纳理工大学);European University of Technology EUT+(欧洲理工大学联盟EUT+);Escuela Superior de Ingeniería y Tecnología, Universidad Internacional de La Rioja(拉里奥哈国际大学高等工程与技术学院);Ulm University(乌尔姆大学);Center for Integrated Quantum Science and Technology (IQST)(集成量子科学与技术中心)
提出 ZENITH 脉冲序列,通过三能级控制消除 V 型简并自旋-1 系统间的偶极相互作用,实现零场下的高保真度、兼容现有传感序列并提升直流检测能力。
We combine the collisional picture for open system dynamics and the control of the rate of decoherence provided by the quantum (anti-)Zeno effect to illustrate the temporal unfolding of the redundant encoding of information into a multipartite environment that is at the basis of Quantum Darwinism, and to control it. The rate at which such encoding occurs can be enhanced or suppressed by tuning the dynamical conditions of system-environment interaction in a suitable and remarkably simple manner. This would help the design of a new generation of quantum experiments addressing the elusive phenome…
The quantum coherence of a multipartite system is investigated when some of the parties are moving with uniform acceleration and the analysis is carried out using the single mode approximation. Due to acceleration the quantum coherence is divided into two parts as accessible and inaccessible coherence and the entire analysis has been carried out in the single-mode approximation. First we investigate tripartite systems, considering both GHZ and W-states. We find that the quantum coherence of these states does not vanish in the limit of infinite acceleration, rather asymptoting to a non-zero val…