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.

Roccati, F., Militello, B., Fiordilino, E., Iaria, R., Burderi, L., Di Salvo, T., et al. (2022). Quantum correlations beyond entanglement in a classical-channel model of gravity. SCIENTIFIC REPORTS, 12(1), 17641 [10.1038/s41598-022-22212-1].

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

Roccati, Federico
Investigation
;
Militello, Benedetto
Investigation
;
Fiordilino, Emilio
Investigation
;
Iaria, Rosario
Investigation
;
Burderi, Luciano
Investigation
;
Di Salvo, Tiziana
Investigation
;
Ciccarello, Francesco
Ultimo
Supervision
2022-10-21

Abstract

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.
Settore FIS/03 - Fisica Della Materia
https://www.nature.com/articles/s41598-022-22212-1
Roccati, F., Militello, B., Fiordilino, E., Iaria, R., Burderi, L., Di Salvo, T., et al. (2022). Quantum correlations beyond entanglement in a classical-channel model of gravity. SCIENTIFIC REPORTS, 12(1), 17641 [10.1038/s41598-022-22212-1].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/574287
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