Quantum teleportation in vacuum using only Unruh-DeWitt detectors

Koga, Jun Ichirou; Kimura, Gen; Maeda, Kenichi

doi:10.1103/physreva.97.062338

Cited by 35 publications

(70 citation statements)

References 59 publications

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“…In Appendix, by applying the framework presented in this paper, we will consider uniformly accelerated detectors that reduce to those in a relative inertial motion in the vanishing acceleration limit, and we will see that it reproduces the result in Ref. [11]. Natural units c = = k B = 1 are used throughout this paper.…”

Section: Introductionmentioning

confidence: 63%

“…The result that no entanglement is extracted in the case of the fiducial system as above, i.e., comoving inertial Unruh-DeWitt detectors in the Minkowski vacuum, was found to be described by the delta function representing the energy conservation [11]. In this paper, we will extend this to the case of uniformly accelerated Unruh-DeWitt detectors.…”

Section: Introductionmentioning

confidence: 84%

“…is satisfied. Moreover, we have computed the optimal fidelity for the standard quantum teleportation [18], and have shown that the entanglement extracted from the vacuum in this manner is usable in the standard quantum teleportation in the symmetric case P A = P B [11]. There exists another possibility for entanglement extraction, which does not occur when Eq.…”

Section: Modelmentioning

confidence: 99%

“…II the model we will consider, the same model as in Ref. [11], and review entanglement measures. In Sec.…”

Section: Introductionmentioning

confidence: 99%

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Entanglement extracted from vacuum into accelerated Unruh-DeWitt detectors and energy conservation

Koga

Kimura

2019

Phys. Rev. D

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We consider a pair of two-level Unruh-DeWitt detectors accelerated uniformly in the Minkowski vacuum of a massless neutral scalar field, and analyze, within the perturbation theory, the entanglement extracted from the vacuum into the Unruh-DeWitt detectors when the switching of the detectors are performed adiabatically enough at the asymptotic past and future. We consider the cases where the detectors are accelerated parallelly, anti-parallelly, and in differently orientated directions. We show that entanglement is extracted if they are accelerated anti-parallelly and the ratios of the excitation energy to the magnitude of the acceleration coincide between the two detectors. On the other hand, we find the detectors are not entangled when the detectors are accelerated parallelly or in orientated directions. We discuss these results from the viewpoint of the energy conservation associated with the timelike boost Killing vector fields tangent to the worldlines of the detectors.

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Section: Introductionmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 84%

Section: Modelmentioning

confidence: 99%

“…II the model we will consider, the same model as in Ref. [11], and review entanglement measures. In Sec.…”

Section: Introductionmentioning

confidence: 99%

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Entanglement extracted from vacuum into accelerated Unruh-DeWitt detectors and energy conservation

Koga

Kimura

2019

Phys. Rev. D

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“…Previous work by Ralph et al uses observers coupling to the vacuum-entangled modes of a massless scalar field (by operating detectors whose time-dependent energy scaling imitates a uniformly accelerated observer interacting with the Rindler modes [8,9,15]) to implement a quantum key distribution protocol, whilst Reznik has offered proof-of-principle propos- * Electronic address: joshua.foo@uqconnect.edu.au † Electronic address: ralph@physics.uq.edu.au als for dense coding and quantum teleportation protocols through vacuum entanglement swapped onto pairs of stationary, spacelike-separated atoms [16]. In [17], the authors employ two Unruh-deWitt detectors in relative inertial motion that interact perturbatively with the field to extract entanglement and perform better-than-classical teleportation. The focus of this paper is also vacuum entanglementenabled quantum teleportation, however here, we adopt a non-perturbative, continuous-variable approach, formulated with observers in relativistic, non-inertial reference frames.…”

Section: Introductionmentioning

confidence: 99%

Continuous-variable quantum teleportation with vacuum-entangled Rindler modes

Foo

Ralph

2020

Phys. Rev. D

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We consider a continuous-variable quantum teleportation protocol between a uniformly accelerated sender in the right Rindler wedge, a conformal receiver restricted to the future light cone, and an inertial observer in the Minkowski vacuum. Using a non-perturbative quantum circuit model, the accelerated observer interacts unitarily with the Rindler modes of the field, thereby accessing entanglement of the vacuum as a resource. We find that a Rindler-displaced Minkowski vacuum state prepared and teleported by the accelerated observer appears mixed according to the inertial observer, despite a reduction of the quadrature variances below classical limits. This is a surprising result, since the same state transmitted directly from the accelerated observer appears as a pure coherent state to the inertial observer. The decoherence of the state is caused by an interplay of opposing effects as the acceleration increases: the reduction of vacuum noise in the output state for a stronger entanglement resource, constrained by the amplification of thermal noise due to the presence of Unruh radiation.

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Fate of entanglement between two Unruh-DeWitt detectors due to their motion and background temperature

Chowdhury

Majhi

2022

J. High Energ. Phys.

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We investigate the fate of initial entanglement between two accelerated detectors with respect to an observer attached to one of the detectors. Both (1 + 1) and (1 + 3) spacetime dimensions are being considered here, with the detectors interacting with real massless scalar fields through monopole terms. The investigation is being performed for both non-thermal as well as thermal fields. In general, irrespective of the detectors moving in the same Rindler wedge or opposite wedges, increase of the field temperature reduces the initial entanglement. In all situations, degradation of entanglement is high for high acceleration aA of our observer. Interestingly, the degradation depends on the measure of initial entanglement. For (1 + 1) dimensions, the degradation saturates for small values of aA, whereas the same fluctuates in (1 + 3) dimensions with the decrease of aA. For motions in opposite Rindler wedges, a noticeable feature we observe in (1 + 1) dimensions is that, depending on the strength of initial entanglement, there is a possibility of entanglement harvesting in the system for certain values of the observers’ acceleration. However the same is absent in (1 + 3) dimensions. The whole analysis is operationally different from earlier similar investigations. The thermal equilibrium is satisfied throughout the calculations here, by considering the Wightman functions with respect to the Rindler modes evaluated in the vacuum of Unruh modes, contrary to the use of Minkowski modes.

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Quantum teleportation in vacuum using only Unruh-DeWitt detectors

Cited by 35 publications

References 59 publications

Entanglement extracted from vacuum into accelerated Unruh-DeWitt detectors and energy conservation

Entanglement extracted from vacuum into accelerated Unruh-DeWitt detectors and energy conservation

Continuous-variable quantum teleportation with vacuum-entangled Rindler modes

Fate of entanglement between two Unruh-DeWitt detectors due to their motion and background temperature

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