Probing mechanical quantum coherence with an ultracold-atom probe
arXiv:1107.0750 · doi:10.1103/PhysRevA.84.063815
Abstract
We propose a scheme to probe quantum coherence in the state of a nano-cantilever based on its magnetic coupling (mediated by a magnetic tip) with a spinor Bose Einstein condensate (BEC). By mapping the BEC into a rotor, its coupling with the cantilever results in a gyroscopic motion whose properties depend on the state of the cantilever: the dynamics of one of the components of the rotor angular momentum turns out to be strictly related to the presence of quantum coherence in the state of the cantilever. We also suggest a detection scheme relying on Faraday rotation, which produces only a very small back-action on the BEC and it is thus suitable for a continuous detection of the cantilever's dynamics.
7 pages, 4 figures
References in corpus (15)
- Laser cooling of a nanomechanical oscillator into its quantum ground state
- Observation of strong coupling between a micromechanical resonator and an optical cavity field
- Radiation-pressure cooling and optomechanical instability of a micro-mirror
- Self-cooling of a micro-mirror by radiation pressure
- Creating and probing macroscoping entanglement with light
- Quantum Optomechanics - throwing a glance
- Bose-Einstein condensate coupled to a nanomechanical resonator on an atom chip
- Quantum Phase Transitions and Continuous Observation of Spinor Dynamics in an Antiferromagnetic Condensate
- Entanglement detection in hybrid optomechanical systems
- Cold-Atom-Induced Control of an Optomechanical Device
- Probing the quantum coherence of a nanomechanical resonator using a superconducting qubit: I. Echo scheme
- Antiferromagnetic Spinor Condensates are Quantum Rotors
- Quantum optomechanics of a Bose-Einstein Antiferromagnet
- Quantum measurement backaction from a BEC coupled to a mechanical oscillator
- Quantum rotor theory of spinor condensates in tight traps