Gravity-enhanced quantum spatial target detection

Liu, Qianqian; Wen, Cuihong; Tian, Zehua; Jing, Jiliang; Wang, Jieci

doi:10.1103/physreva.105.062428

Cited by 7 publications

(2 citation statements)

References 47 publications

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“…Among the growing literature on this topic there are studies that investigate the effects of gravity on quantum communication [43,62], quantum key distribution [139,140], quantum illumination [141,142] to name a few. In general, it is clear that nontrivial modifications of standard protocols are predicted and it has even been argued that the effects need not be small [43].…”

Section: Quantum Key Distributionmentioning

confidence: 99%

Introduction to gravitational redshift of quantum photons propagating in curved spacetime

Rodríguez

Schell

Bruschi

2023

J. Phys.: Conf. Ser.

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Gravitational redshift is discussed in the context of quantum photons propagating in curved spacetime. A brief introduction to modelling realistic photons is first presented and the effect of gravity on the spectrum computed for photons largely confined along the direction of propagation. It is then shown that redshift-induced transformations on photon operators with sharp momenta are not unitary, while a unitary transformation can be constructed for realistic photons with finite bandwidth. The unitary transformation obtained is then characterized as a multimode mixing operation, which is a generalized rotation of the Hilbert-space basis. Finally, applications of these results are discussed with focus on performance of quantum communication protocols, exploitation of the effects for quantum metrology and sensing, as well as potential for tests of fundamental science.

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Section: Quantum Key Distributionmentioning

confidence: 99%

Introduction to gravitational redshift of quantum photons propagating in curved spacetime

Rodríguez

Schell

Bruschi

2023

J. Phys.: Conf. Ser.

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“…This finding is similar to the performance of QI in the Earth's gravitational field. [54] We now proceed to give a physical interpretation of this phenomenon. When the quantum ranging task is operating in a curved spacetime, the gravitational effects deform both the signal âS and the local thermal state âB .…”

Section: Quantum Target Ranging In Curved Spacetimementioning

confidence: 99%

Entanglement‐Enhanced Quantum Ranging in Near‐Earth Spacetime

Liu,

Wen,

Jing

et al. 2023

Adv Quantum Tech

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A quantum ranging protocol to determine the distance between an observer and a target in the near‐Earth curved spacetime is proposed. Unlike quantum illumination, the quantum ranging scheme utilizes multiple quantum hypothesis testing to simultaneously determine the presence and location of the target. The interest is in how the Earth's spacetime curvature influences photon propagation as well as the performance of the quantum ranging. It is found that the maximum potential advantage of the quantum ranging strategy in the curved spacetime outperforms its flat spacetime counterpart. It is shown that the number of transmitted modes can enhance the maximum potential advantage of the quantum ranging tasks. In contrast, the maximum potential advantage of quantum ranging cannot be significantly increased by dividing the range into multiple slices in the curved spacetime.

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N-partite coherence of bosonic fields in the background of a Schwarzschild black hole

Li²,

Zeng³

et al. 2022

Quantum Inf Process

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Gravity-enhanced quantum spatial target detection

Cited by 7 publications

References 47 publications

Introduction to gravitational redshift of quantum photons propagating in curved spacetime

Introduction to gravitational redshift of quantum photons propagating in curved spacetime

Entanglement‐Enhanced Quantum Ranging in Near‐Earth Spacetime

N-partite coherence of bosonic fields in the background of a Schwarzschild black hole

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