Quantum Energy Teleportation in Spin Chain Systems

Hotta, Masahiro

doi:10.1143/jpsj.78.034001

Cited by 69 publications

(72 citation statements)

References 6 publications

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“…Of course, such a perturbative approach can only be taken when the coupling λ between qubit and field is small with respect to the other scales of the problem. If instead a strong-coupling result is sought after, there are various non-perturbative methods that can be used (see, among others, [12,[22][23][24][25][26][27][28][29]). In this study, to attain non-perturbative results, we are going to consider the qubit detector switching function to be…”

Section: Setupmentioning

confidence: 99%

Transmission of quantum information through quantum fields

et al. 2020

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We investigate the quantum channel consisting of two localized quantum systems that communicate through a scalar quantum field. We choose a scalar field rather than a tensor or vector field, such as the electromagnetic field, in order to isolate the situation where the qubits are carried by the field amplitudes themselves rather than, for example, by encoding qubits in the polarization of photons. We find that suitable protocols for this type of quantum channel require the careful navigation of several constraints, such as the no-cloning principle, the strong Huygens principle and the tendency of field-matter couplings that are short to be entanglement breaking. We nonperturbatively construct a protocol for such a quantum channel that possesses maximal quantum capacity.

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Section: Setupmentioning

confidence: 99%

Transmission of quantum information through quantum fields

et al. 2020

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“…[28][29][30]). On the other hand, for finite dimensional detectors, non-perturbative time-evolution can be computed when the detector's Hamiltonian is completely degenerate (i.e., all detector states have identical energies [12,13,31]), or when the detector interacts with the field at one instant in time (i.e, via a Dirac-δ coupling) [32,33]. In particular, using these approaches, the following no-go entanglement harvesting theorems were proved: i) Perturbatively, it is not possible to harvest spacelike vacuum entanglement with zero-gap detectors [34], and ii) non-perturbatively it is not possible to harvest any kind of entanglement (timelike, lightlike, or spacelike) from a coherent field state using single δcoupled detectors [15].…”

Section: Introductionmentioning

confidence: 99%

General no-go theorem for entanglement extraction

2018

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We study under what circumstances a separable bipartite system A-B can or cannot become entangled through local interactions with a bi-local entangled source S1-S2. We obtain constraints on the general forms of the interaction Hamiltonians coupling A with S1 and B with S2 necessary for A and B to become entangled. We are able to generalize and provide non-perturbative insight on several previous no-go theorems of entanglement harvesting from quantum fields using these general results. We also discuss the role of communication in the process of entanglement extraction, establishing a distinction between genuine entanglement extraction and communication-assisted entanglement generation.

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“…Besides being an interesting focus of study in its own right, the presence of entanglement between local degrees of freedom in general field states (and in particular the vacuum [1,2]) has been used as a means to better understand important fundamental questions, from the black hole information loss problem [3][4][5][6][7][8], to the dynamics of quantum phase transitions in statistical mechanics [9,10]. Moreover, operational approaches which harness this entanglement to perform useful tasks have also been studied, leading to, for example, the development of protocols for quantum energy teleportation [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Harvesting correlations from thermal and squeezed coherent states

Simidzija

Martín-Martínez

2018

Phys. Rev. D

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We study the harvesting of entanglement and mutual information by Unruh-DeWitt particle detectors from thermal and squeezed coherent field states. We prove (for arbitrary spatial dimensions, switching profiles and detector smearings) that while the entanglement harvesting ability of detectors decreases monotonically with the field temperature T , harvested mutual information grows linearly with T . We also show that entanglement harvesting from a general squeezed coherent state is independent of the coherent amplitude, but depends strongly on the squeezing amplitude. Moreover, we find that highly squeezed states i) allow for detectors to harvest much more entanglement than from the vacuum, and ii) ensure that the entanglement harvested does not decay with their spatial separation. Finally we analyze the spatial inhomogeneity of squeezed states and its influence on harvesting, and investigate how much entanglement one can actually extract from squeezed states when the squeezing is bandlimited. * psimidzija@uwaterloo.ca † emartinmartinez@uwaterloo.ca arXiv:1809.05547v1 [quant-ph]

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Quantum Energy Teleportation in Spin Chain Systems

Cited by 69 publications

References 6 publications

Transmission of quantum information through quantum fields

Transmission of quantum information through quantum fields

General no-go theorem for entanglement extraction

Harvesting correlations from thermal and squeezed coherent states

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