Decoherence of Einstein–Podolsky–Rosen steering

Rosales-Zárate, L.; Teh, R. Y.; Kiesewetter, Simon; Brolis, Alessandro; Ng, K.M.; Reid, M. D.

doi:10.1364/josab.32.000a82

Cited by 62 publications

(50 citation statements)

References 92 publications

(205 reference statements)

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“…The steering strengths in two directions may not be the same [22], especially, a special type is known as one-way EPR steering where the entangled states show steering in one direction but not in the other [7,23]. The asymmetric EPR steering has attracted considerable attention recently for both theory [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] and experiment [14,23,[41][42][43][44][45][46]. One important method used in above studies to produce directional steering is making the states asymmetric by adding different amount of losses or noises on the subsystems.…”

Section: Introductionmentioning

confidence: 99%

Manipulation and enhancement of asymmetric steering via interference effects induced by closed-loop coupling

et al. 2019

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We present a phase control method for a general three-mode system with closed-loop in coupling that drives the system into an entangled steady state and produces directional steering between two completely symmetric modes via quantum interference effects. In the scheme, two modes are coupled with each other both by a direct binary interaction and by an indirect interaction through a third intermediate damping mode, creating interference effects determined by the relative phase between the two physical interaction paths. By calculating the populations and correlations of the two modes, we show that depending on the phase, two modes can be prepared into an entangled steady state with asymmetric and directional steering even if they possess completely symmetric decoherence properties. Meanwhile, entanglement and steering can be significantly enhanced due to constructive interference, and thus more robust to thermal noises. This provides an active method to manipulate the asymmetry of steering instead of adding asymmetric losses or noises on subsystems at the cost of reducing steerability. Moreover, we show that the interference effects can also enhance and control the correlations between other pair of modes in the loop with opposite phase dependent behavior, indicating monogamy constraints for distributing correlations among multipartite. The present model could be applied in cavity optomechanical systems or in antiferromagnets where all components can mutually interact.

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Section: Introductionmentioning

confidence: 99%

Manipulation and enhancement of asymmetric steering via interference effects induced by closed-loop coupling

et al. 2019

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“…Wiseman, Jones, and Doherty [4] rigorously defined the concept of steering in terms of violations of local hidden state model, and revealed that steering is an intermediate type of quantum correalation between entanglement [5,6] and Bell nonlocality [7,8], where local measurements on one subsystem can apparently adjust (steer) the state of another distant subsystem [9][10][11][12]. Such correlation is intrinsically asymmetric with respect to the two subsystems [13][14][15][16][17][18][19], and allows verification of shared entanglement even if the measurement devices of one subsystem are untrusted [11]. Due to this intriguing feature, steering has been identified as a physical resource for one-sided device-independent (1sDI) quantum cryptography [20][21][22][23][24], secure quantum teleportation [25][26][27], and subchannel discrimination [28].…”

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confidence: 99%

Demonstration of Monogamy Relations for Einstein-Podolsky-Rosen Steering in Gaussian Cluster States

et al. 2017

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. Understanding how quantum resources can be quantified and distributed over many parties has profound applications in quantum communication. As one of the most intriguing features of quantum mechanics, Einstein-Podolsky-Rosen (EPR) steering is a useful resource for secure quantum networks. By reconstructing the covariance matrix of a continuous variable four-mode square Gaussian cluster state subject to asymmetric loss, we quantify the amount of bipartite steering with a variable number of modes per party, and verify recently introduced monogamy relations for Gaussian steerability, which establish quantitative constraints on the security of information shared among different parties. We observe a very rich structure for the steering distribution, and demonstrate one-way EPR steering of the cluster state under Gaussian measurements, as well as one-to-multimode steering. Our experiment paves the way for exploiting EPR steering in Gaussian cluster states as a valuable resource for multiparty quantum information tasks.

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“…Several * These two authors contributed equally to this work. theoretical [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] and experimental studies [23][24][25][26][27][28][29][30][31] have focused on the verification and applications of EPR steering. Experimental demonstrations of one-way steering with the measurements restricted to Gaussian measurements have been reported [24,25].…”

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confidence: 99%

Experimental Quantification of Asymmetric Einstein-Podolsky-Rosen Steering

et al. 2016

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Einstein-Podolsky-Rosen (EPR) steering describes the ability of one observer to nonlocally "steer" the other observer's state through local measurements. EPR steering exhibits a unique asymmetric property, i.e., the steerability can differ between observers, which can lead to one-way EPR steering in which only one observer obtains steerability in the steering process. This property is inherently different from the symmetric concepts of entanglement and Bell nonlocality, and it has attracted increasing interest. Here, we experimentally demonstrate asymmetric EPR steering for a class of two-qubit states in the case of two measurement settings. We propose a practical method to quantify the steerability. We then provide a necessary and sufficient condition for EPR steering and clearly demonstrate one-way EPR steering. Our work provides new insight into the fundamental asymmetry of quantum nonlocality and has potential applications in asymmetric quantum information processing.Quantum nonlocality, which does not have a counterpart in classical physics, is the characteristic feature of quantum mechanics. First noted in the famous paper published by Einstein, Podolsky and Rosen (EPR) in 1935 [1], which aimed to argue the completeness of quantum mechanics, the content of quantum nonlocality has been greatly extended. In 2007, Wiseman et al. summarized the different conditions of quantum nonlocality and reformulated the concept of steering [2] originally introduced by Schrödinger [3] in response to the EPR paper (usually referred to as EPR steering), which stands between entanglement [1] and Bell nonlocality [4] in the hierarchy. In the view of a quantum information task, EPR steering can be regarded as the distribution of entanglement from an untrusted party, whereas entangled states need both parties to trust each other, and Bell nonlocality is presented on the premise that they distrust each other [5,6]. As a result, some entangled states cannot be employed to realize steering, and some steerable states do not violate Bell-like inequalities. EPR steering provides a novel insight into quantum nonlocality, and it exhibits an inherent asymmetric feature that differs from both entanglement and Bell nonlocality. Consider two observers, Alice and Bob, who share entangled states. There are cases in which the ability of Alice to steer Bob's state is not equal to the ability of Bob to steer Alice's state. There are also situations in which Alice can steer Bob's state but Bob cannot steer Alice's state, or vice versa; these situations are referred to as one-way steering [2,7]. Several * These two authors contributed equally to this work. theoretical [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] and experimental studies [23][24][25][26][27][28][29][30][31] have focused on the verification and applications of EPR steering. Experimental demonstrations of one-way steering with the measurements restricted to Gaussian measurements have been reported [24,25]. A class of entangled qubit states that can be used to show th...

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Decoherence of Einstein–Podolsky–Rosen steering

Cited by 62 publications

References 92 publications

Manipulation and enhancement of asymmetric steering via interference effects induced by closed-loop coupling

Manipulation and enhancement of asymmetric steering via interference effects induced by closed-loop coupling

Demonstration of Monogamy Relations for Einstein-Podolsky-Rosen Steering in Gaussian Cluster States

Experimental Quantification of Asymmetric Einstein-Podolsky-Rosen Steering

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