Generating quantum discord between two distant Bose–Einstein condensates with Bell-like detection

Eghbali-Arani, Mohammad; Yavari, H.; Shahzamanian, M. A.; Giovannetti, Vittorio; Barzanjeh, Sh.

doi:10.1364/josab.32.000798

Cited by 9 publications

(6 citation statements)

References 54 publications

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“…Experimentally, there are many qubits inside each cavity. In this way, the qubits inside each dissipative cavity can be considered as a Bose-Einstein condensate in an optical cavity [70] in the presence of thermal noise which plays the role of the dissipation. Then, the output of the optical cavity of each node is sent to an intermediate site where a Bell-like detection is performed on these optical pairs.…”

Section: Entanglement Swappingmentioning

confidence: 99%

“…Then, the output of the optical cavity of each node is sent to an intermediate site where a Bell-like detection is performed on these optical pairs. [70] According to the wave function (7), one observes that there exist only the vacuum and first excited states of the field modes in each system. Therefore, it is possible to consider the following Bell-like states of the fields: [71] |ψ…”

Section: Entanglement Swappingmentioning

confidence: 99%

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Qubit movement-assisted entanglement swapping

2020

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We propose a scheme to generate entanglement between two distant qubits (two-level atom) which are separately trapped in their own (in general) non-Markovian dissipative cavities by utilizing entangling swapping, considering the case in which the qubits can move along their cavity axes rather than a static state of motion. We first examine the role of movement of the qubit by studying the entropy evolution for each subsystem. The average entropy over the initial states of the qubit is calculated. Then by performing a Bell state measurement on the fields leaving the cavities, we swap the entanglement between qubit-field in each cavity into qubit-qubit and field-field subsystems. The entangling power is used to measure the average amount of swapped entanglement over all possible pure initial states. Our results are presented in two weak and strong coupling regimes, illustrating the positive role of movement of the qubits on the swapped entanglement. It is revealed that by considering certain conditions for the initial state of qubits, it is possible to achieve a maximally long-leaving stationary entanglement (Bell state) which is entirely independent of the environmental variables as well as the velocity of qubits. This happens when the two qubits have the same velocities.

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Section: Entanglement Swappingmentioning

confidence: 99%

Section: Entanglement Swappingmentioning

confidence: 99%

Qubit movement-assisted entanglement swapping

2020

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“…The output mode of the optical cavity is given by the standard input-output relation âout = √ 2κâ − âin . One can also define the selected output mode by means of the causal filter function âfilt = t t0 F (t − s)â out (s)ds, where the causal filter function F (t) = 2/τ exp[−(1/τ + iΩ)t]Θ(t) is characterized by central frequency Ω, bandwidth 1/τ , and the Heaviside step function Θ(t) [29][30][31]. In the frequency domain, the stationary CM for the quantum fluctuations of the mirror, BEC, and the output mode of the optical cavity variables, u filt (t) = [q, p, Q, P , Xfilt , Ŷ filt ] T , takes the form…”

Section: B Optomechanical Entanglement Of Output Modesmentioning

confidence: 99%

Entanglement of two hybrid optomechanical cavities composed of BEC atoms under Bell detection

Eghbali-Arani

Ameri

2016

Quantum Inf Process

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In this paper, firstly, we consider bipartite entanglement between each part of an optomechanical cavity composed of one dimensional Bose-Einstein condensate (BEC). We investigate atomic collision on the behavior of the BEC in the week photon-atom coupling constant, and use Bogoliubov approximation for the BEC. Secondly under above condition, we propose a scheme for entanglement swapping protocol wich involves tripartite systems. In our investigation, we consider a scenario where BECs, moving mirrors, and optical cavity modes are given in a Gaussian state with a covariance matrix (CM). By applying the Bell measurement to the output optical field modes, we show how the remote entanglement between two BECs, two moving mirrors, and BEC-mirror modes in different optomechanical cavity can be generated.

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“…The creation of quantum discord by applying a Bell-like detection on optical cavities and the amplification of QD via cavity-BEC for initially coupled or uncoupled qubits has been proposed in Ref. [13,17,28]. The dynamics of a single impurity and the collective dephasing of a two spatial states impurity in BEC has been explored [29,30].…”

Section: Introductionmentioning

confidence: 99%

Phonon-mediated quantum discord in dark solitons

Shaukat

Slaoui

Terças³

et al. 2020

Eur. Phys. J. Plus

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We investigate the quantum correlation dynamics in a dark-soliton qubits with special attention to quantum discord. Recently, dark-soliton qubit exhibiting appreciably long lifetime are proved to be an excellent candidate for information processing. Depending on the precise distance between the dark-soliton qubits, the decay rate of Dicke symmetric and antisymmetric state is suppressed or enhanced. With the Renyi-2 entropy, we derive a simple analytical expression for the quantum discord, and explore the generation and decay of correlation for different initial states. We believe the present work could pave the stage for a new generation of quantum discord based purely on matter-wave phononics.

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Generating quantum discord between two distant Bose–Einstein condensates with Bell-like detection

Cited by 9 publications

References 54 publications

Qubit movement-assisted entanglement swapping

Qubit movement-assisted entanglement swapping

Entanglement of two hybrid optomechanical cavities composed of BEC atoms under Bell detection

Phonon-mediated quantum discord in dark solitons

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