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Träfflista för sökning "WFRF:(Hoelscher Obermaier J.) "

Sökning: WFRF:(Hoelscher Obermaier J.)

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1.
  • Gut, C., et al. (författare)
  • Stationary optomechanical entanglement between a mechanical oscillator and its measurement apparatus
  • 2020
  • Ingår i: PHYSICAL REVIEW RESEARCH. - 2643-1564. ; 2:3
  • Tidskriftsartikel (refereegranskat)abstract
    • We provide an argument to infer stationary entanglement between light and a mechanical oscillator based on continuous measurement of light only. We propose an experimentally realizable scheme involving an optomechanical cavity driven by a resonant, continuous-wave field operating in the non-sideband-resolved regime. This corresponds to the conventional configuration of an optomechanical position or force sensor. We show analytically that entanglement between the mechanical oscillator and the output field of the optomechanical cavity can be inferred from the measurement of squeezing in (generalized) Einstein-Podolski-Rosen quadratures of suitable temporal modes of the stationary light field. Squeezing can reach levels of up to 50% of noise reduction below shot noise in the limit of large quantum cooperativity. Remarkably, entanglement persists even in the opposite limit of small cooperativity. Viewing the optomechanical device as a position sensor, entanglement between mechanics and light is an instance of object-apparatus entanglement predicted by quantum measurement theory.
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2.
  • Brunelli, M., et al. (författare)
  • Experimental Determination of Irreversible Entropy Production in out-of-Equilibrium Mesoscopic Quantum Systems
  • 2018
  • Ingår i: Physical Review Letters. - 1079-7114 .- 0031-9007. ; 121:16
  • Tidskriftsartikel (refereegranskat)abstract
    • By making use of a recently proposed framework for the inference of thermodynamic irreversibility in bosonic quantum systems, we experimentally measure and characterize the entropy production rates in the nonequilibrium steady state of two different physical systems a micromechanical resonator and a Bose-Einstein condensate each coupled to a high finesse cavity and hence also subject to optical loss. Key features of our setups, such as the cooling of the mechanical resonator and signatures of a structural quantum phase transition in the condensate, are reflected in the entropy production rates. Our work demonstrates the possibility to explore irreversibility in driven mesoscopic quantum systems and paves the way to a systematic experimental assessment of entropy production beyond the microscopic limit.
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