AI Article Synopsis
- Classical systems allow measurements without causing disturbance, while quantum systems do not, particularly in the context of gravity.
- The proposed experimental setup involves multiple interferometers to measure a gravitational field created by a spatial superposition, aiming to demonstrate nonclassical effects.
- This test is unique as it doesn't rely on specific nonclassical gravity forms or entanglement, and it can detect quantum measurement disturbance regardless of decoherence rates, making it device independent.
Article Abstract
A defining signature of classical systems is "in principle measurability" without disturbance: a feature manifestly violated by quantum systems. We describe a multi-interferometer experimental setup that can, in principle, reveal the nonclassicality of a spatial superposition-sourced gravitational field if an irreducible disturbance is caused by a measurement of gravity. While one interferometer sources the field, the others are used to measure the gravitational field created by the superposition. This requires neither any specific form of nonclassical gravity, nor the generation of entanglement between any relevant degrees of freedom at any stage, thus distinguishing it from the experiments proposed so far. This test, when added to the recent entanglement-witness based proposals, enlarges the domain of quantum postulates being tested for gravity. Moreover, the proposed test yields a signature of quantum measurement induced disturbance for any finite rate of decoherence, and is device independent.
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| http://dx.doi.org/10.1103/PhysRevLett.133.180201 | DOI Listing |
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