All coherent field states entangle equally

Simidzija, Petar; Martín-Martínez, Eduardo

doi:10.1103/physrevd.96.025020

Cited by 24 publications

(33 citation statements)

References 42 publications

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Section: B Encoding a Qubit Into A Fieldmentioning

confidence: 55%

“…a single use of the channel can transmit at most one qubit), we thus conclude that in the limit λ φ /σ → ∞, the quantum channel capacity Q(Ξ) approaches its maximum value of 1. In other words, we have verified, without the use of any approximations, that the field-mediated quantum channel from Alice to Bob is indeed a perfect quantum channel if the conditions (35) and (36) are satisfied.…”

Section: A Gaussian Detector Smearingmentioning

confidence: 69%

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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: B Encoding a Qubit Into A Fieldmentioning

confidence: 55%

Section: A Gaussian Detector Smearingmentioning

confidence: 69%

Transmission of quantum information through quantum fields

et al. 2020

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“…We will then consider the case of squeezed coherent states [37], where, to the authors' knowledge, no previous literature exists. We will first prove that the statement "entanglement harvesting is independent of the field's coherent amplitude" is true not only for non-squeezed coherent states, as was shown in [34], but also for arbitrarily squeezed coherent states. On the other hand we will show that, unlike the coherent amplitude, the choice of field's squeezing amplitude ζ(k) does in fact affect the ability of UDW detectors to become entangled, and moreover the Fourier transform of ζ(k) directly gives the locations in space near which entanglement harvesting is optimal.…”

Section: Introductionmentioning

confidence: 79%

“…Furthermore, for harmonic oscillator detectors, this noise has been found to increase with field temperature, leading to detrimental effects on the amount of entanglement harvested [18] by oscillator pairs. Meanwhile, and perhaps surprisingly, for UDW detectors interacting with coherent states of the field, the presence of leading order local noise does not end up affecting the amount of entanglement that can be harvested from the field [34,35].…”

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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“…To see the form of this matrix in general when the onepoint function of (a single) field does not vanish one can check, e.g., equation (55) of [23].…”

Section: Analysis Of Pairs Of Detectorsmentioning

confidence: 99%

Entanglement harvesting and divergences in quadratic Unruh-DeWitt detector pairs

2017

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We analyze scenarios in which pairs of Unruh-DeWitt-like detectors interact with scalar field(s) with bi-linear and quadratic coupling. For all cases -real scalar fields, charged scalar fields, and even for couplings mixing two different scalar fields -we find that the detectors' dynamics depends on the Wightman function of a real scalar field with the same functional form up to a constant multiple. Consequently entanglement harvesting exhibits low sensitivity to either the kind of scalar field or their charged nature. Furthermore, we show on general grounds that pairs of Unruh-DeWitt-like detectors exhibit persistent divergences when they interact with scalar field(s) with a quadratic or bi-linear coupling and discuss possible avenues to improve the models through the regularization of such divergences. * asachs@uwaterloo.ca † rbmann@uwaterloo.ca ‡ emartinmartinez@uwaterloo.ca

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All coherent field states entangle equally

Cited by 24 publications

References 42 publications

Transmission of quantum information through quantum fields

Transmission of quantum information through quantum fields

Harvesting correlations from thermal and squeezed coherent states

Entanglement harvesting and divergences in quadratic Unruh-DeWitt detector pairs

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