Experimental detection of polarization-frequency quantum correlations in a photonic quantum channel by local operations

Tang, Jian‐Shun; Wang, Yi Tao; Chen, Geng; Zou, Yang; Li, Chuan‐Feng; Guo, Guang‐Can; Yu, Ying; Li, Mi-Feng; Zha, Guo-Wei; Ni, Haiqiao; Niu, Zhichuan; Gessner, Manuel; Breuer, Heinz‐Peter

doi:10.1364/optica.2.001014

Cited by 25 publications

(26 citation statements)

References 42 publications

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“…The information flow is defined by means of the behavior in time of the distinguishability of two open system states and non-Markovianity is characterized by a non-monotonic time evolution of the distinguishability. Experimental control and measurements of non-Markovian quantum dynamics and of the closely connected impact of initial system-environment correlations have been reported for photonic systems [8][9][10][11][12][13][14], nuclear magnetic resonance [15], and trapped ion systems [16,17].…”

Section: Introductionmentioning

confidence: 99%

Mixing-induced quantum non-Markovianity and information flow

2018

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Keywords: open quantum systems, non-Markovian quantum dynamics, distinguishability of quantum states, mixing quantum dynamical maps, system-environment correlations, information flow Abstract Mixing dynamical maps describing open quantum systems can lead from Markovian to non-Markovian processes. Being surprising and counter-intuitive, this result has been used as argument against characterization of non-Markovianity in terms of information exchange. Here, we demonstrate that, quite the contrary, mixing can be understood in a natural way which is fully consistent with existing theories of memory effects. In particular, we show how mixing-induced non-Markovianity can be interpreted in terms of the distinguishability of quantum states, systemenvironment correlations and the information flow between system and environment.

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Section: Introductionmentioning

confidence: 99%

Mixing-induced quantum non-Markovianity and information flow

2018

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“…where |i, p describes a particle with spin state |i and momentum p, and |α| 2 + |β| 2 = 1. Such processes are encountered in many physical systems, including cavity-QED systems [21], birefringent optical materials [23], and trapped ions under sideband transitions [22,24]. In the following we focus on identical bosonic particles, where the above process is combined with an interference effect due to the indistinguishability of the particles [29,30].…”

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confidence: 99%

Hyper- and hybrid nonlocality

Gessner

et al. 2018

Phys. Rev. Lett.

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The controlled generation and identification of quantum correlations, usually encoded in either qubits or continuous degrees of freedom, builds the foundation of quantum information science. Recently, more sophisticated approaches, involving a combination of two distinct degrees of freedom have been proposed to improve on the traditional strategies. Hyperentanglement describes simultaneous entanglement in more than one distinct degree of freedom, whereas hybrid entanglement refers to entanglement shared between a discrete and a continuous degree of freedom. In this work we propose a scheme that allows to combine the two approaches, and to extend them to the strongest form of quantum correlations. Specifically, we show how two identical, initially separated particles can be manipulated to produce Bell nonlocality among their spins, among their momenta, as well as across their spins and momenta. We discuss possible experimental realizations with atomic and photonic systems. Introduction.-Sharing quantum correlations between distant parties is an indispensable condition for most tasks in quantum communication [1]. In the most common scenario, quantum information is encoded into a single, well-controlled degree of freedom (DOF), such as spin, polarization, or external degrees of freedom [2,3]. In some cases, however, establishing entanglement among several DOF can provide a decisive advantage [4][5][6][7][8][9][10][11][12]. For example, so-called hyperentanglement, i.e., entanglement in multiple DOF [4], can improve the capacity of dense coding in linear optics [7], or enhance the performance of quantum teleportation [6]. Similarly, architectures using hybrid entanglement, i.e., entanglement across discrete and continuous variables [5,13], have been suggested as a promising platform for quantum information, being able to overcome the limitations posed by the finite detection efficiencies of traditional approaches to quantum cryptography and computing [8,12].

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“…Combining this with dissipative dynamics and genuine quantum baths in non-Markovian dynamics poses important challenges for future experimental work.There are also other areas, such as quantum metrology [45] or probing of complex quantum systems [46], where interesting theoretical results exists though experimental implementations are still lacking to large extent. Note that the work on non-Markovian dynamics has opened also experimental possibilities for the local detection of quantum correlations [47,48].…”

Section: Conclusion and Outlook -mentioning

confidence: 99%

Non-Markovian quantum dynamics: What is it good for?

Guo

Piilo

2020

EPL

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Recent developments in practical quantum engineering and control techniques have allowed significant developments for experimental studies of open quantum systems and decoherence engineering. Indeed, it has become possible to test experimentally various theoretical, mathematical, and physical concepts related to non-Markovian quantum dynamics. This includes experimental characterization and quantification of non-Markovian memory effects and proof-ofprinciple demonstrations how to use them for certain quantum communication and information tasks. We describe here recent experimental advances for open system studies, focussing in particular to non-Markovian dynamics including the applications of memory effects, and discuss the possibilities for ultimate control of decoherence and open system dynamics.Introduction. -Closed quantum systems evolve by unitary dynamics conserving, e.g., the purity of the evolving quantum state. Thereby, having ability to prepare any initial pure quantum state for a given system, and having arbitrary time dependent and controllable Hamiltonian driving the system, allows to create any pure state trajectory in the system's Hilbert space -at least in principle. For an open quantum system interacting with its environment, the problematics of quantum control becomes more challenging. An open system, whose Hamiltonian we may be able to control to certain extent, interacts with a large number of uncontrollable degrees of freedom. The open system dynamics becomes non-unitary and the systemenvironment interaction tends, e.g., to reduce the purity of the open system state via decoherence, i.e., making it more mixed and classical-like. The question now becomes how can we control, not only how decoherence influences the open system dynamics, but also whether it is possible to control the loss of purity -and even increase the purity and revive the quantum properties at least temporarily?

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Experimental detection of polarization-frequency quantum correlations in a photonic quantum channel by local operations

Cited by 25 publications

References 42 publications

Mixing-induced quantum non-Markovianity and information flow

Mixing-induced quantum non-Markovianity and information flow

Hyper- and hybrid nonlocality

Non-Markovian quantum dynamics: What is it good for?

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