Cavity boundaries suppress distillable entanglement negativity between Unruh-DeWitt detectors but preserve mutual information and enhance quantum discord at larger separations.
Quantum discord between relatively accelerated observers
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abstract
We calculate the quantum discord between two free modes of a scalar field which start in a maximally entangled state and then undergo a relative, constant acceleration. In a regime where there is no distillable entanglement due to the Unruh effect, we show that there is a finite amount of quantum discord, which is a measure of purely quantum correlations in a state, over and above quantum entanglement. Even in the limit of infinite acceleration of the observer detecting one of the modes, we provide evidence for a non-zero amount of purely quantum correlations, which might be exploited to gain non-trivial quantum advantages.
fields
quant-ph 1years
2026 1verdicts
UNVERDICTED 1representative citing papers
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Cavity-Induced Suppression of Entanglement and Enhancement of Quantum Discord
Cavity boundaries suppress distillable entanglement negativity between Unruh-DeWitt detectors but preserve mutual information and enhance quantum discord at larger separations.