Gravity as a classical channel and its dissipative generalization

Bartolomeo, Giovanni Di; Carlesso, Matteo; Bassi, Angelo

doi:10.1103/physrevd.104.104027

Cited by 7 publications

(20 citation statements)

References 52 publications

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“…If so, however, as the quantum nature of matter is wellestablished one should yet conceive a hybrid scenario where a classical channel mediates gravitational interactions between intrinsically quantum masses. Several models of this kind have been proposed [5][6][7][8][9][10]. In these models, typically, the conjectured classical channel gives rise to the Newtonian potential, yet causing at the same time decoherence affecting the quantum masses [11].…”

Section: Introductionmentioning

confidence: 99%

“…In these models, typically, the conjectured classical channel gives rise to the Newtonian potential, yet causing at the same time decoherence affecting the quantum masses [11]. Decoherence plays against the entanglement that would arise from the Newtonian potential, the net result being that no entanglement can be generated in such models in agreement with their classical nature [5][6][7][8][9][10]. More specifically, this follows from the fact that they rely only on local operations and classical communication (LOCC), namely operations unable to create entanglement (this being a distinctive property of entanglement itself) [12].…”

Section: Introductionmentioning

confidence: 99%

“…With the above motivations, this work addresses the question as to whether or not quantum correlations according to this extended paradigm can be generated in a classical channel model of gravity and, if so, whether they are stable or eventually decay at large times. We carry out this task in the case study of the Kafri Taylor Milburn (KTM) model [6] and its recently proposed dissipative version [10]. This allows to consider a relatively simple system made out of a pair of quantum harmonic oscillators for which effective techniques were developed to compute quantum discord [19,20] (calculation of discord is generally quite challenging [15,16]).…”

Section: Introductionmentioning

confidence: 99%

“…Such generated discord eventually undergoes a slow decay in the case of the KTM model, while it converges to a finite, although small, stationary value for its dissipative extension in Ref. [10]. The paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

“…In Section VI, we study creation of QCs in the dissipative version of the KTM model recently introduced in Ref. [10] (which is first reviewed). Finally, we present our conclusions in Section VII.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Quantum correlations beyond entanglement in a classical-channel model of gravity

Roccati,

Militello,

Fiordilino

et al. 2022

Preprint

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A direct quantization of the Newtonian interaction between two masses is known to establish entanglement, which if detected would witness the quantum nature of the gravitational field. Gravitational interaction is yet compatible also with gravitational decoherence models relying on classical channels, hence unable to create entanglement. Here, we show in paradigmatic cases that, despite the absence of entanglement, a classical-channel model of gravity can still establish quantum correlations in the form of quantum discord between two masses. This is demonstrated for the Kafri-Taylor-Milburn (KTM) model and a recently proposed dissipative extension of this. In both cases, starting from an uncorrelated state, a significant amount of discord is generally created. This eventually decays in the KTM model, while it converges to a small stationary value in its dissipative extension. We also find that initial local squeezing on the state of the masses can significanlty enhance the generated discord.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Quantum correlations beyond entanglement in a classical-channel model of gravity

Roccati,

Militello,

Fiordilino

et al. 2022

Preprint

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Quantum correlations beyond entanglement in a classical-channel model of gravity

Roccati

Fiordilino

Iaria

et al. 2022

Sci Rep

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A direct quantization of the Newtonian interaction between two masses is known to establish entanglement, which if detected would witness the quantum nature of the gravitational field. Gravitational interaction is yet compatible also with gravitational decoherence models relying on classical channels, hence unable to create entanglement. Here, we show in paradigmatic cases that, despite the absence of entanglement, a classical-channel model of gravity can still establish quantum correlations in the form of quantum discord between two masses. This is demonstrated for the Kafri–Taylor–Milburn (KTM) model and a recently proposed dissipative extension of this. In both cases, starting from an uncorrelated state, a significant amount of discord is generally created. This eventually decays in the KTM model, while it converges to a small stationary value in its dissipative extension. We also find that initial local squeezing on the state of the masses can significanlty enhance the generated discord.

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On the testability of the Károlyházy model

Figurato,

Bassi,

Donadi

2024

New J. Phys.

Self Cite

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Károlyházy’s original proposal, suggesting that space-time fluctuations could be a source of decoherencein space, faced a significant challenge due to an unexpectedly high emission of radiation(13 orders of magnitude more than what was observed in the latest experiment). To address thisissue, we reevaluated Károlyházy’s assumption that the stochastic metric fluctuation must adhereto a wave equation. By considering more general correlation functions of space-time fluctuations,we resolve the problem and consequently revive the aforementioned proposal.

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Gravity as a classical channel and its dissipative generalization

Cited by 7 publications

References 52 publications

Quantum correlations beyond entanglement in a classical-channel model of gravity

Quantum correlations beyond entanglement in a classical-channel model of gravity

Quantum correlations beyond entanglement in a classical-channel model of gravity

On the testability of the Károlyházy model

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