Quantum decoherence of an anharmonic oscillator monitored by a Bose-Einstein condensate

Abstract

The dynamics of a quantum anharmonic oscillator whose position is monitored by a Bose-Einstein condensate (BEC) trapped in a symmetric double well potential is studied. The (non-exponential) decoherence induced on the oscillator by the measuring device is analysed. A detailed quasiclassical and quantum analysis is presented. In the first case, for an arbitrary initial coherent state, two different decoherence regimes are observed: An initial Gaussian decay followed by a power law decay for longer times. The characteristic time scales of both regimes are reported. Analytical approximated expressions are obtained in the full quantum case where algebraic time decay of decoherence is observed.

References in corpus (12)

• Emergence of atom-light-mirror entanglement inside an optical cavity
• Bose-Einstein condensate coupled to a nanomechanical resonator on an atom chip
• Establishing EPR-channels between Nanomechanics and Atomic Ensembles
• Cavity optomechanical coupling assisted by an atomic gas
• Ion trap transducers for quantum electromechanical oscillators
• Dynamics of a nanomechanical resonator coupled to a superconducting single-electron transistor
• Cavity-Enhanced Long-Distance Coupling of an Atomic Ensemble to a Micromechanical Membrane
• Probing the quantum coherence of a nanomechanical resonator using a superconducting qubit: I. Echo scheme
• Quantum mechanical approach to decoherence and relaxation generated by fluctuating environment
• Coupling nanomechanical cantilevers to dipolar molecules
• Unusual decoherence in qubit measurements with a Bose-Einstein condensate
• Probing the quantum coherence of a nanomechanical resonator using a superconducting qubit II: Implementation