Quantum Magnetomechanics: Ultrahigh-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Q</mml:mi></mml:math>-Levitated Mechanical Oscillators

Cirio, Mauro; Brennen, Gavin K.; Twamley, J.

doi:10.1103/physrevlett.109.147206

Cited by 59 publications

(59 citation statements)

References 40 publications

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“…This is largely due to the ability to use laser cooling techniques to prepare harmonically trapped particles of large mass in the ground state [24,30]. It is possible that carefully controlled optical levitation [25][26][27][28], or magnetic levitation [29,30] experiments on two gravitationally coupled masses might reach the regime discussed in this paper but it will not be easy. It should be noted in connection with equation (33) that laser cooling also changes both the temperature and the quality factor.…”

Section: An Experimental Test Of Gravitational Decoherencementioning

confidence: 99%

A classical channel model for gravitational decoherence

Kafri¹,

Taylor²,

Milburn³

2014

New J. Phys.

156

258

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We show that, by treating the gravitational interaction between two mechanical resonators as a classical measurement channel, a gravitational decoherence model results that is equivalent to a model first proposed by Diosi. The resulting decoherence model implies that the classically mediated gravitational interaction between two gravitationally coupled resonators cannot create entanglement. The gravitational decoherence rate (and the complementary heating rate) is of the order of the gravitationally induced normal mode splitting of the two resonators. Failure to see this in an experiment would rule out treating gravitational interactions as purely classical.

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Section: An Experimental Test Of Gravitational Decoherencementioning

confidence: 99%

A classical channel model for gravitational decoherence

Kafri¹,

Taylor²,

Milburn³

2014

New J. Phys.

156

258

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“…CNTs with high factor Q = ω q / ≈ 150 000 have been found in laboratories [51,52]. The Q factor of a suspended CNT would be reduced in the presence of a magnetic field and be adjusted by the back gate to some extent [53,54].…”

Section: Nonunitrary Evolutionmentioning

confidence: 99%

Creating arbitrary quantum vibrational states in a carbon nanotube

Wang

Burkard

2016

Phys. Rev. B

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We theoretically study the creation of single- and multi-phonon Fock states and arbitrary superpositions of quantum phonon states in a nanomechanical carbon nanotube (CNT) resonator. In our model, a doubly clamped CNT resonator is initialized in the ground state and a single electron is trapped in a quantum dot which is formed by a electric gate potential and brought into the magnetic field of a micro-magnet. The preparation of arbitrary quantum phonon states is based on the coupling between the mechanical motion of the CNT and the electron spin which acts as a non-linearity. We assume that electrical driving pulses with different frequencies are applied on the system. The quantum information is transferred from the spin qubit to the mechanical motion by the spin-phonon coupling and the electron spin qubit can be reset by the single-electron spin resonance. We describe Wigner tomography which can be applied at the end to obtain the phase information of the prepared phonon states.Comment: 8 pages, 5 figure

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“…These supercurrents generate magnetic fields and these couple via mutual inductance M rq to the currents flowing in the resonator. With this coupling one can use the flux qubit to cool the motional state of the resonator27, and in addition one can use the qubit to coherently control the motion of the resonator28. We will use this latter capability to perform the interferometry protocol.…”

Section: Gravimeter Designmentioning

confidence: 99%

Macroscopic superpositions and gravimetry with quantum magnetomechanics

Johnsson

Brennen

Twamley

2016

Sci Rep

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Precision measurements of gravity can provide tests of fundamental physics and are of broad practical interest for metrology. We propose a scheme for absolute gravimetry using a quantum magnetomechanical system consisting of a magnetically trapped superconducting resonator whose motion is controlled and measured by a nearby RF-SQUID or flux qubit. By driving the mechanical massive resonator to be in a macroscopic superposition of two different heights our we predict that our interferometry protocol could, subject to systematic errors, achieve a gravimetric sensitivity of Δg/g ~ 2.2 × 10−10 Hz−1/2, with a spatial resolution of a few nanometres. This sensitivity and spatial resolution exceeds the precision of current state of the art atom-interferometric and corner-cube gravimeters by more than an order of magnitude, and unlike classical superconducting interferometers produces an absolute rather than relative measurement of gravity. In addition, our scheme takes measurements at ~10 kHz, a region where the ambient vibrational noise spectrum is heavily suppressed compared the ~10 Hz region relevant for current cold atom gravimeters.

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Quantum Magnetomechanics: Ultrahigh-Q-Levitated Mechanical Oscillators

Cited by 59 publications

References 40 publications

A classical channel model for gravitational decoherence

A classical channel model for gravitational decoherence

Creating arbitrary quantum vibrational states in a carbon nanotube

Macroscopic superpositions and gravimetry with quantum magnetomechanics

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