Quantum-measurement backaction from a Bose-Einstein condensate coupled to a mechanical oscillator

Steinke, Steven; Singh, Swati; Tașgın, Mehmet Emre; Meystre, Pierre; Schwab, Keith; Vengalattore, Mukund

doi:10.1103/physreva.84.023841

Cited by 21 publications

(27 citation statements)

References 20 publications

(36 reference statements)

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“…During completion of this work, a related investigation reporting on the measurement back-action on a vibrating membrane coupled to a BEC has appeared [27]. While the detailed context and general approach differ from ours, this work reinforces the idea that quantum coherence in mechanical systems can be reliably probed by ultracold atomic systems.…”

Section: Discussionsupporting

confidence: 61%

Probing mechanical quantum coherence with an ultracold-atom meter

et al. 2011

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We propose a scheme to probe quantum coherence in the state of a nanocantilever 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 is thus suitable for a continuous detection of the cantilever's dynamics

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Section: Discussionsupporting

confidence: 61%

Probing mechanical quantum coherence with an ultracold-atom meter

et al. 2011

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“…Let the static magnetic properly set along the z-axis: B 0 = Be z with B is the amplitude of the applied static magnetic field. Approximating the magnetic tip as magnetic dipole, we have the field gradient which is similar to [16,18,27]: …”

Section: Hybrid System Of a Mechanical Oscillator And Bec Atomsmentioning

confidence: 99%

Cooling flexural modes of a mechanical oscillator by magnetically trapped Bose-Einstein-condensate atoms

Xu¹,

Xue²

2017

Phys. Rev. A

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We theoretically study cooling of flexural modes of a mechanical oscillator by Bose-Einstein Condensate (BEC) atoms (Rb87) trapped in a magnetic trap. The mechanical oscillator with a tiny magnet attached on one of its free ends produces an oscillating magnetic field. When its oscillating frequency matches certain hyperfine Zeeman energy of Rb87 atoms, the trapped BEC atoms are coupled out of the magnetic trap by the mechanical oscillator, flying away from the trap with stolen energy from the mechanical oscillator. Thus the mode temperature of the mechanical oscillator is reduced. The mode temperature of the steady state of the mechanical oscillator, measured by the mean steady-state phonon number in the flexural mode of the mechanical oscillator, is analyzed. It is found that ground state (phonon number less than 1) may be accessible with optimal parameters of the hybrid system of a mechanical oscillator and trapped BEC atoms.

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“…This often requires the construction of hybrid systems, in which mechanical degrees of freedom are strongly coupled with optical or atomic degrees of freedoms; this involves: (i) the transfer of quantum information between a mechanical mode and an optical/microwave mode [283,284,285], between mechanical mode and a single atom [286,287,288,289,290] or an atomic ensemble [291,292,293,294,295], (ii) the use of mechanical motion as transducers that mediate interactions between optical/atomic or other mechanical modes [296,297,298,299,300,301,302], (iii) the use of mechanical structure with internal dynamics to confine atoms [303,304]. Quantum information processing protocols using optomechanics alone have also been proposed [305,306,307,308].…”

Section: Optomechanics As Part Of Quantum Technology and Many-body Opmentioning

confidence: 99%

Macroscopic quantum mechanics: theory and experimental concepts of optomechanics

Chen¹

2013

J. Phys. B: At. Mol. Opt. Phys.

269

302

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Abstract. Rapid experimental progress has recently allowed the use of light to prepare macroscopic mechanical objects into nearly pure quantum states. This research field of quantum optomechanics opens new doors toward testing quantum mechanics, and possibly other laws of physics, in new regimes. In the first part of this paper, I will review a set of techniques of quantum measurement theory that are often used to analyze quantum optomechanical systems. Some of these techniques were originally designed to analyze how a classical driving force passes through a quantum system, and can eventually be detected with optimal signal-to-noise ratio -while others focus more on the quantum state evolution of a mechanical object under continuous monitoring. In the second part of this paper, I will review a set of experimental concepts that will demonstrate quantum mechanical behavior of macroscopic objects -quantum entanglement, quantum teleportation, and the quantum Zeno effect. Taking the interplay between gravity and quantum mechanics as an example, I will review a set of speculations on how quantum mechanics can be modified for macroscopic objects, and how these speculations -and their generalizations -might be tested by optomechanics.

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Quantum-measurement backaction from a Bose-Einstein condensate coupled to a mechanical oscillator

Cited by 21 publications

References 20 publications

Probing mechanical quantum coherence with an ultracold-atom meter

Probing mechanical quantum coherence with an ultracold-atom meter

Cooling flexural modes of a mechanical oscillator by magnetically trapped Bose-Einstein-condensate atoms

Macroscopic quantum mechanics: theory and experimental concepts of optomechanics

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