Time evolution techniques for detectors in relativistic quantum information

Bruschi, David Edward; Lee, Antony R.; Fuentes, Ivette

doi:10.1088/1751-8113/46/16/165303

Cited by 89 publications

(136 citation statements)

References 59 publications

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“…In this regime, when T λ is no longer small, the transition matrix elements of −iH I T are no longer small, i.e., the perturbation theory that we have used so far then breaks down. Here, it should be very interesting to apply the recently developed nonperturbative methods for detectors that are harmonic oscillators [4,23] in order to extend our present study into the nonperturbative regime.…”

Section: Discussionmentioning

confidence: 99%

Quantum signaling in cavity QED

2014

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We consider quantum signaling between two-level quantum systems in a cavity in the perturbative regime of the earliest possible arrival times of the signal. We present two main results: First, we find that, perhaps surprisingly, the analog of amplitude modulated signaling (Alice using her energy eigenstates |g , |e , as in the Fermi problem) is generally suboptimal for communication, namely, e.g., phase-modulated signaling (Alice using, e.g., {|+ , |− } states) overcomes the quantum noise already at a lower order in perturbation theory. Second, we study the effect of mode truncations that are commonly used in cavity QED on the modeling of the communication between two-level atoms. We show that, on general grounds, namely for causality to be preserved, the UV cutoff must scale at least polynomially with the desired accuracy of the predictions.

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Section: Discussionmentioning

confidence: 99%

Quantum signaling in cavity QED

2014

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“…ω>0 dω|F (ω)| 2 = 1. This distribution naturally models a photon which is a wave packet of the electromagnetic field that propagates and is localized in space and time [24].…”

Section: Light Wave-packets Propagating On Earth's Space-timementioning

confidence: 99%

Quantum estimation of the Schwarzschild spacetime parameters of the Earth

et al. 2014

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We propose a quantum experiment to measure with high precision the Schwarzschild space-time parameters of the Earth. The scheme can also be applied to measure distances by taking into account the curvature of the Earth's space-time. As a wave-packet of (entangled) light is sent from the Earth to a satellite it is red-shifted and deformed due to the curvature of space-time. Measurements after the propagation enable the estimation of the space-time parameters. We compare our results with the state of the art, which involves classical measurement methods, and discuss what developments are required in space-based quantum experiments to improve on the current measurement of the Schwarzschild radius of the Earth.

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“…This is not a loss of generality: indeed, if the pumps have nonzero phases, χ ab = |χ ab |e iϕ ab , χ bc = |χ bc |e iϕ bc we can obtain the evolution U from Eq. (20) Here we use a recently developed technique [53,54] (see also [55] for an alternative approach) to obtain a more convenient representation of the operator (20), based on the Lie algebra structure of the SL(3,C) group [37]. In Appendix A we show that it is possible to re-write the operator (20) …”

Section: Generation Of Bisqueezed Tripartite Gaussian Statesmentioning

confidence: 99%

Entanglement, coherence, and redistribution of quantum resources in double spontaneous down-conversion processes

2017

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We study the properties of bisqueezed tripartite Gaussian states created by two spontaneous parametric down-conversion processes that share a common idler. We give a complete description of the quantum correlations across all partitions, as well as of the genuine multipartite entanglement, obtaining analytical expressions for most of the quantities of interest. We find that the state contains genuine tripartite entanglement, in addition to the bipartite entanglement among the modes that are directly squeezed. We also investigate the effect of homodyne detection of the photons in the common idler mode, and analyze the final reduced state of the remaining two signal modes. We find that this measurement leads to a conversion of the coherence of the two signal modes into entanglement, a phenomenon that can be regarded as a redistribution of quantum resources between the modes. The applications of these results to quantum optics and circuit quantum electrodynamics platforms are also discussed.

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Time evolution techniques for detectors in relativistic quantum information

Cited by 89 publications

References 59 publications

Quantum signaling in cavity QED

Quantum signaling in cavity QED

Quantum estimation of the Schwarzschild spacetime parameters of the Earth

Entanglement, coherence, and redistribution of quantum resources in double spontaneous down-conversion processes

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