Taming a macroscopic free mass through continuous quantum measurement

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1. Très proche Base de cet article Cité par cet article Pas pertinent

   Measurement-based quantum control of mechanical motion

   M. Rossi, David Mason, Junxin Chen et al. · 2018 · Nature · cité 444 fois · Pas encore résumé

   Measurement-based quantum control décrit le contrôle par mesure efficace et rétroaction, cadre théorique que l’étude applique au rotor libre.

   Résumé scientifique

   Controlling a quantum system by using observations of its dynamics is complicated by the backaction of the measurement process—that is, the unavoidable quantum disturbance caused by coupling the system to a measurement apparatus. An efficient measurement is one that maximizes the amount of information gained per disturbance incurred. Real-time feedback can then be used to cancel the backaction of the measurement and to control the evolution of the quantum state. Such measurement-based quantum control has been demonstrated in the clean settings of cavity and circuit quantum electrodynamics, but its application to motional degrees of freedom has remained elusive. Here we demonstrate measuremen…

2. Très proche Autre approche du problème Cité par cet article Pas pertinent

   Observing and Verifying the Quantum Trajectory of a Mechanical Resonator.

   M. Rossi, David Mason, Junxin Chen et al. · 2018 · Physical Review Letters · cité 98 fois · Pas encore résumé

   Observing and Verifying suit une trajectoire quantique mécanique par mesure optique continue, tandis que l’étude localise un rotor libre massif.

   Résumé scientifique

   Continuous weak measurement allows localizing open quantum systems in state space and tracing out their quantum trajectory as they evolve in time. Efficient quantum measurement schemes have previously enabled recording quantum trajectories of microwave photon and qubit states. We apply these concepts to a macroscopic mechanical resonator, and we follow the quantum trajectory of its motional state conditioned on a continuous optical measurement record. Starting with a thermal mixture, we eventually obtain coherent states of 78% purity-comparable to a displaced thermal state of occupation 0.14. We introduce a retrodictive measurement protocol to directly verify state purity along the trajector…

3. Très proche Même question Cité par cet article Utilisé en profondeur par cet article Pas pertinent

   One-milligram torsional pendulum toward experiments at the quantum-gravity interface

   Sofia Agafonova, P. Rosselló, Manuel Mekonnen et al. · 2024 · Communications Physics · cité 17 fois · Pas encore résumé

   One-milligram torsional pendulum étudie un pendule torsionnel milligramme pour des expériences à l’interface quantique-gravité, comme l’étude du rotor libre.

   Résumé scientifique

   Probing the possibility of entanglement generation through gravity offers a path to tackle the question of whether gravitational fields possess a quantum mechanical nature. A potential realization necessitates systems with low-frequency dynamics at an optimal mass scale, for which the microgram-to-milligram range is a strong contender. Here, after refining a figure-of-merit for the problem, we present a 1-milligram torsional pendulum operating at 18 Hz. We demonstrate laser cooling its motion from room temperature to 240 microkelvins, surpassing by over 20-fold the coldest motions attained for oscillators ranging from micrograms to kilograms. We quantify and contrast the utility of the curre…

4. Proche Même méthode, autre problème Cité par cet article Pas pertinent

   Mechanical Squeezing via Fast Continuous Measurement.

   Chao Meng, G. Brawley, J. Bennett et al. · 2019 · Physical Review Letters · cité 29 fois · Pas encore résumé

   Mechanical Squeezing calcule la préparation d’états conditionnels par mesure continue de position, méthode également utilisée pour contrôler le mouvement mécanique.

   Résumé scientifique

   We revisit quantum state preparation of an oscillator by continuous linear position measurement. Quite general analytical expressions are derived for the conditioned state of the oscillator. Remarkably, we predict that quantum squeezing is possible outside of both the backaction dominated and quantum coherent oscillation regimes, relaxing experimental requirements even compared to ground-state cooling. This provides a new way to generate nonclassical states of macroscopic mechanical oscillators, and opens the door to quantum sensing and tests of quantum macroscopicity at room temperature.

5. Proche Contexte plus large Pas pertinent

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   Résumé scientifique

   Massive mechanical oscillators couple directly to forces, accelerations and gravity, making them attractive probes of new physics and of quantum mechanics at macroscopic scales. Pushing sensitivities beyond the standard quantum limit for signals of unknown phase requires non-Gaussian quantum states, whose metrological advantage has so far been confined to lighter systems such as trapped ions. Here we operate a microgram-scale acoustic mode of a high-overtone bulk acoustic wave resonator as a phase-insensitive quantum-enhanced sensor. A transmon qubit prepares the mode in Fock states of up to seven phonons by optimal control, and resolves its phonon-number distribution after interaction with …

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   Quantum Measurement and Control

   C. Kiefer · 2010 · Classical and Quantum Gravity · cité 2 134 fois · Pas encore résumé

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   Generating quantum entanglement between macroscopic objects with continuous measurement and feedback control

   Daisuke Miki, N. Matsumoto, Akira Matsumura et al. · 2022 · Physical Review A · cité 25 fois · Pas encore résumé

   Generating quantum entanglement modélise la mesure continue et la rétroaction pour préparer des états mécaniques, plutôt que localiser un rotor libre.

   Résumé scientifique

   This study is aimed at investigating the feasibility of generating quantum entanglement between macroscopic mechanical mirrors in optomechanical systems while under continuous measurement and feedback control. We carefully derive a covariance matrix for mechanical mirrors in a steady state, employing the Kalman filtering problem with an assumed dominant cavity photon dissipation, such that the common and differential modes of the mirrors are squeezed by the action of measuring the output light beams. We demonstrate that entanglement between the mechanical mirrors is generated when the states of the common and differential modes are squeezed with high purity in an asymmetric manner. Our resul…

8. Proche Même méthode, autre problème Cité par cet article Pas pertinent

   Feedback cooling of a nanomechanical resonator

   A. Hopkins, K. Jacobs, S. Habib et al. · 2003 · Physical Review B · cité 161 fois · Pas encore résumé

   Feedback cooling propose de refroidir un résonateur par observation continue de sa position, une stratégie de contrôle apparentée à celle de l’étude.

   Résumé scientifique

   Cooled, low-loss nanomechanical resonators offer the prospect of directly observing the quantum dynamics of mesoscopic systems. However, the present state of the art requires cooling down to the milliKelvin regime in order to observe quantum effects. Here we present an active feedback strategy based on continuous observation of the resonator position for the purpose of obtaining these low temperatures. In addition, we apply this to an experimentally realizable configuration, where the position monitoring is carried out by a single-electron transistor. Our estimates indicate that with current technology this technique is likely to bring the required low temperatures within reach.

Les travaux antérieurs sur lesquels il s’appuie

1. Proche Contexte plus large Pas pertinent

   Schrödinger cat states of a 16-microgram mechanical oscillator

   Marius Bild, M. Fadel, Yu Yang et al. · 2022 · Science · cité 218 fois · Pas encore résumé

   Schrödinger cat states prépare des superpositions de mouvement dans un oscillateur massif et étudie leur décohérence, autre test de la mécanique quantique macroscopique.

   Résumé scientifique

   According to quantum mechanics, a physical system can be in any linear superposition of its possible states. Although the validity of this principle is routinely validated for microscopic systems, it is still unclear why we do not observe macroscopic objects to be in superpositions of states that can be distinguished by some classical property. Here we demonstrate the preparation of a mechanical resonator in Schrödinger cat states of motion, where the ∼1017 constituent atoms are in a superposition of two opposite-phase oscillations. We control the size and phase of the superpositions and investigate their decoherence dynamics. Our results offer the possibility of exploring the boundary betwe…

2. Proche Contexte plus large Pas pertinent

   Measurement of the motional sidebands of a nanogram-scale oscillator in the quantum regime

   M. Underwood, David Mason, Dong-Hun Lee et al. · 2014 · Physical Review A · cité 85 fois · Pas encore résumé

   Measurement of the motional sidebands mesure un oscillateur nanogramme proche de son état fondamental, tandis que l’étude porte sur un rotor milligramme libre.

   Résumé scientifique

   We describe measurements of the motional sidebands produced by a mechanical oscillator (with effective mass 43 ng and resonant frequency 705 kHz) that is placed in an optical cavity and cooled close to its quantum ground state. The red and blue sidebands (corresponding to Stokes and anti-Stokes scattering) from a single laser beam are recorded simultaneously via a heterodyne measurement. The oscillator’s mean phonon number ¯ n is inferred from the ratio of the sidebands, and reaches a minimum value of 0.84 ± 0.22 (corresponding to a mode temperature T = 28 ± 7 μ K). We also infer¯ n from the calibrated area of each of the two sidebands, and from the oscillator’s total damping. The values of …

3. Proche Même méthode, autre problème Pas pertinent

   Spin squeezing of 1011 atoms by prediction and retrodiction measurements

   Han Bao, Jun-Lei Duan, Shen-Chao Jin et al. · 2018 · Nature · cité 149 fois · Pas encore résumé

   Spin squeezing génère un état quantique par mesures de prédiction et rétrodiction, approche de mesure apparentée mais appliquée au spin atomique.

   Résumé scientifique

   The measurement sensitivity of quantum probes using N uncorrelated particles is restricted by the standard quantum limit1, which is proportional to 1/N\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$1/\sqrt{N}$$\end{document}. This limit, however, can be overcome by exploiting quantum entangled states, such as spin-squeezed states2. Here we report the measurement-based generation of a quantum state that exceeds the standard quantum limit for probing the collective spin of 1011 rubidium atoms contained in a macros…

4. Proche Base de cet article Pas pertinent

   Quantum theory of feedback cooling of an anelastic macromechanical oscillator

   K. Komori, D. Ďurovčíková, V. Sudhir · 2021 · Physical Review A · cité 7 fois · Pas encore résumé

   Quantum theory of feedback cooling traite le refroidissement par rétroaction d’un oscillateur anélastique à basse fréquence, pertinent pour le régime mécanique étudié.

   Résumé scientifique

   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 w…

5. Proche Même question Pas pertinent

   Room temperature test of the continuous spontaneous localization model using a levitated micro-oscillator

   Di Zheng, Ying-Chun Leng, X. Kong et al. · 2019 · Physical Review Research · cité 53 fois · Pas encore résumé

   Room temperature test utilise un micro-oscillateur à faible dissipation pour contraindre le modèle CSL, comme l’étude teste des modifications de la mécanique quantique.

   Résumé scientifique

   The Continuous Spontaneous Localization (CSL) model predicts a tiny break of energy conservation via a weak stochastic force acting on physical systems, which triggers the collapse of the wave function. Mechanical oscillators are a natural way to test such a force; in particular levitated micro-mechanical oscillator has been recently proposed to be an ideal system. We report a proof-of-principle experiment with a micro-oscillator generated by a micro-sphere diamagnetically levitated in a magneto-gravitational trap under high vacuum. Due to the ultra-low mechanical dissipation, the oscillator provides a new upper bound on the CSL collapse rate, which gives an improvement of two orders of magn…