Coupling Modifies the Quantum Fluctuations of Entangled Oscillators

Coupled oscillators are among the simplest composite quantum systems in which the interplay of entanglement and interaction may be explored. We examine the effects of coupling on the quantum fluctuations of the coordinates and momenta of the oscillators in a single-excitation entangled Bell-like sta...

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Bibliographic Details
Published in:Brazilian journal of physics 2021-06, Vol.51 (3), p.559-565
Main Authors: Santos, Roberto Baginski B., Lisboa, Vinicius S. F.
Format: Article
Language:English
Subjects:
Condensed Matter
Coupling
Momentum
Noise
Oscillators
Physics
Physics and Astronomy
Quantum entanglement
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Summary:Coupled oscillators are among the simplest composite quantum systems in which the interplay of entanglement and interaction may be explored. We examine the effects of coupling on the quantum fluctuations of the coordinates and momenta of the oscillators in a single-excitation entangled Bell-like state. We discover that coupling acts as a mechanism for noise transfer between one pair of coordinate and momentum and another. Through this noise transfer mechanism, the uncertainty product is lowered, on average, relatively to its non-coupled level for one pair of coordinate and momentum and it is enhanced for the other pair. This novel mechanism for noise transfer may be explored in precision measurements in entanglement-assisted sensing and metrology.
ISSN:0103-9733
1678-4448
DOI:10.1007/s13538-021-00878-8