Constraints on probing quantum coherence to infer gravitational
entanglement
- URL: http://arxiv.org/abs/2106.08221v2
- Date: Mon, 8 Nov 2021 13:34:35 GMT
- Title: Constraints on probing quantum coherence to infer gravitational
entanglement
- Authors: Onur Hosten
- Abstract summary: Gravity mediated entanglement generation so far appears to be the key ingredient for a potential experiment.
With measurements performed only on the atoms, a coherence revival test is proposed for verifying this entanglement generation.
We explore formulations of such a protocol, and specifically find that in the envisioned regime of operation with high thermal excitation, semi-classical models, where there is no concept of entanglement, also give the same experimental signatures.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Finding a feasible scheme for testing the quantum mechanical nature of the
gravitational interaction has been attracting an increasing level of attention.
Gravity mediated entanglement generation so far appears to be the key
ingredient for a potential experiment. In a recent proposal [D. Carney et al.,
Phys. Rev. X Quantum 2, 030330 (2021)] combining an atom interferometer with a
low-frequency mechanical oscillator, a coherence revival test is proposed for
verifying this entanglement generation. With measurements performed only on the
atoms, this protocol bypasses the need for correlation measurements. Here we
explore formulations of such a protocol, and specifically find that in the
envisioned regime of operation with high thermal excitation, semi-classical
models, where there is no concept of entanglement, also give the same
experimental signatures. We elucidate in a fully quantum mechanical calculation
that entanglement is not the source of the revivals in the relevant parameter
regime. We argue that, in its current form, the suggested test is only relevant
if the oscillator is nearly in a pure quantum state, and in this regime the
effects are too small to be measurable. We further discuss potential open ends.
The results highlight the importance and subtleties of explicitly considering
how the quantum case differs from the classical expectations when testing for
the quantum mechanical nature of a physical system.
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