Laser cooling of a Planck mass object close to the quantum ground state

Neuhaus, Leonhard; Metzdorff, R.; Zerkani, Salim; Chua, S.; Teissier, Jean; García-Sánchez, Daniel; Deléglise, S.; Jacqmin, T.; Briant, T.; Degallaix, J.; Dolique, V.; Cagnoli, G.; Traon, O. Le; Chartier, C.; Heidmann, A.; Cohadon, P.-F.

doi:10.48550/arxiv.2104.11648

Cited by 2 publications

(3 citation statements)

References 20 publications

(24 reference statements)

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“…Device B can operate at a higher effective temperature for both choices of σ, which is attributed to the 1/Ω 2 dependence of N max . These relatively high effective temperatures required by Device B are encouraging given recent experimental progress in cooling Planck mass objects 55 .…”

Section: Comparison To Thermal Decoherence Ratementioning

confidence: 88%

Can the displacemon device test objective collapse models?

Kanari-Naish

Clarke

Vanner

et al. 2021

AVS Quantum Science

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Testing the limits of the applicability of quantum mechanics will deepen our understanding of the universe and may shed light on the interplay between quantum mechanics and gravity. At present there is a wide range of approaches for such macroscopic tests spanning from matter-wave interferometry of large molecules to precision measurements of heating rates in the motion of micro-scale cantilevers. The “displacemon” is a proposed electromechanical device consisting of a mechanical resonator flux-coupled to a superconducting qubit enabling generation and readout of mechanical quantum states. In the original proposal, the mechanical resonator was a carbon nanotube, containing 106 nucleons. Here, in order to probe quantum mechanics at a more macroscopic scale, we propose using an aluminum mechanical resonator on two larger mass scales, one inspired by the Marshall–Simon–Penrose–Bouwmeester moving-mirror proposal, and one set by the Planck mass. For such a device, we examine the experimental requirements needed to perform a more macroscopic quantum test and thus feasibly detect the decoherence effects predicted by two objective collapse models: Diósi–Penrose and continuous spontaneous localization. Our protocol for testing these two theories takes advantage of the displacemon architecture to create non-Gaussian mechanical states out of equilibrium with their environment and then analyzes the measurement statistics of a superconducting qubit. We find that with improvements to the fabrication and vibration sensitivities of these electromechanical devices, the displacemon device provides a new route to feasibly test decoherence mechanisms beyond standard quantum theory.

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Section: Comparison To Thermal Decoherence Ratementioning

confidence: 88%

Can the displacemon device test objective collapse models?

Kanari-Naish

Clarke

Vanner

et al. 2021

AVS Quantum Science

View full text Add to dashboard Cite

show abstract

“…The purity with which quantum states of tangibly massive objects can be prepared remains an open experimental challenge [1][2][3]. Although workers in the fields of atomic physics [4][5][6][7][8][9], and more recently cavity optomechanics [10][11][12][13][14][15][16][17][18], have succeeded in addressing this challenge at sub-nanogram mass scales, objects with a significantly larger mass feature a qualitatively different behavior.…”

Section: Introductionmentioning

confidence: 99%

“…decreases quadratically with frequency, in marked contrast to a velocity damped oscillator (for which the scaling is linear). This can be harnessed by stiffening the oscillator -for example by radiation pressure forces from a cavity field [30][31][32] -so as to establish an oscillator mode at the frequency Ω eff Ω 0 , whose thermal decoherence rate, Γ th [Ω eff ] = Γ th [Ω 0 ](Ω 0 /Ω eff ) 2 , can be significantly lower than that of the intrinsic mode (at frequency Ω 0 ). However, this will be counteracted by additional decoherence from quantum fluctuations of the optical field used to produce the optical spring.…”

Section: Introductionmentioning

confidence: 99%

Quantum theory of feedback cooling of an anelastic macro-mechanical oscillator

Komori,

Ďurovčíková,

Sudhir

2021

Preprint

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Conventional techniques for laser cooling, by coherent scattering off of internal states or through an optical cavity mode, have so far proved inefficient on mechanical oscillators heavier than a few nanograms. That is because larger oscillators vibrate at frequencies much too small compared to the scattering rates achievable by their coupling to auxiliary modes. Decoherence mechanisms typically observed in heavy low frequency elastically suspended oscillators also differ markedly from what is assumed in conventional treatments of laser cooling. We show that for a low-frequency anelastic oscillator forming the mechanically compliant end-mirror of a cavity, detuned optical readout, together with measurement-based feedback to stiffen and dampen it, can harness ponderomotively generated quantum correlations, to realize efficient cooling to the motional ground state. This will pave the way for experiments that call for milligram-scale mechanical oscillators prepared in pure motional states, for example, for tests of gravity's effect on massive quantum systems.

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Laser cooling of a Planck mass object close to the quantum ground state

Cited by 2 publications

References 20 publications

Can the displacemon device test objective collapse models?

Can the displacemon device test objective collapse models?

Quantum theory of feedback cooling of an anelastic macro-mechanical oscillator

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