Quantum nondemolition measurement of mechanical motion quanta

Dellantonio, Luca; Kyriienko, Oleksandr; Marquardt, Florian; Sørensen, Anders S.

doi:10.1038/s41467-018-06070-y

Cited by 25 publications

(25 citation statements)

References 49 publications

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“…Mechanical oscillators are generally very linear harmonic oscillators at the quantum scale and to achieve arbitrary quantum control, one needs an extrinsic non-linearity [4]. Performing nonlinear detection is also a way to enable quantum nondemolition measurement by measuring energy instead of position or momentum [5][6][7]. One strategy is to use the Josephson junction used in superconducting microwave circuits.…”

mentioning

confidence: 99%

Phonon-Number-Sensitive Electromechanics

Viennot

Lehnert

2018

Phys. Rev. Lett.

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We use the strong intrinsic non-linearity of a microwave superconducting qubit with a 4 GHz transition frequency to directly detect and control the energy of a micro-mechanical oscillator vibrating at 25 MHz. The qubit and the oscillator are coupled electrostatically at a rate of approximately 2π×22 MHz. In this far off-resonant regime, the qubit frequency is shifted by 0.52 MHz per oscillator phonon, or about 14% of the 3.7 MHz qubit linewidth. The qubit behaves as a vibrational energy detector and from its lineshape we extract the phonon number distribution of the oscillator. We manipulate this distribution by driving number state sensitive sideband transitions and creating profoundly non-thermal states. Finally, by driving the lower frequency sideband transition, we cool the oscillator and increase its ground state population up to 0.48±0.13, close to a factor of 8 above its value at thermal equilibrium. These results demonstrate a new class of electromechanics experiments that are a promising strategy for quantum non-demolition measurements and non-classical state preparation.

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mentioning

confidence: 99%

Phonon-Number-Sensitive Electromechanics

Viennot

Lehnert

2018

Phys. Rev. Lett.

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“…These requirements may be realized in current and near-future experiments. In fact, there are many platforms that can be used to implement our scheme, including membrane-in-the-middle configurations [80,86,88,89,95,[134][135][136], ultracold atoms inside a cavity [85], photonic crystals [93,94,98,101], circuit QED [96], electromechanical systems [74,[81][82][83]103,104], microdisks [87,[90][91][92], and optically levitated particles [97,99,105,[137][138][139]. In particular, very large quadratic couplings are within reach of current experiments [87,94,98,140,141].…”

Section: Experimental Feasibilitymentioning

confidence: 99%

Unconditional measurement-based quantum computation with optomechanical continuous variables

et al. 2022

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Universal quantum computation encoded over continuous variables can be achieved via Gaussian measurements acting on entangled non-Gaussian states. However, due to the weakness of available nonlinearities, generally these states can only be prepared conditionally, potentially with low probability. Here we show how universal quantum computation could be implemented unconditionally using an integrated platform able to sustain both linear and quadratic optomechanical-like interactions. Specifically, considering cavity opto-and electromechanical systems, we propose a realization of a driven-dissipative dynamics that deterministically prepares the required non-Gaussian cluster states-entangled squeezed states of multiple mechanical oscillators suitably interspersed with cubic-phase states. We next demonstrate how arbitrary Gaussian measurements on the cluster nodes can be performed by continuously monitoring the output cavity field. Finally, the feasibility requirements of this approach are analyzed in detail, suggesting that its building blocks are within reach of current technology.

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“…Repeated or continuous measurements with such probes gradually project the system of interest on an energy eigenstate [7][8][9][10][11][12][13][14][15], and they may be used to identify, quantum jumps in its excitation dynamics [16][17][18][19][20][21][22][23]. Variants of QND measurements include stroboscopic QND measurements, such as brief position measurements carried out around times t n = nπ/ω of an harmonic oscillator with frequency ω [24][25][26], to enable the study of periodically evolving properties of quantum systems, and emergent QND measurements, which probe a physical observable very weakly and effectively, over time, extract its expectation value in one of the energy eigenstates [27,28]. Other strategies employ additional degrees of freedom to evade back action and thereby reach ultimate sensitivity with quantum probes [29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Quantum non-demolition measurements of moving target states

Andersen¹,

Mølmer²

2022

Preprint

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We present a protocol for probing the state of a quantum system by its resonant coupling and entanglement with a meter system. By continuous measurement of a time evolving meter observable, we infer the evolution of the entangled systems and, ultimately, the state and dynamics of the system of interest. The photon number in a cavity field is thus resolved by simulated monitoring of the time dependent excited state population of a resonantly coupled two-level system, and we propose to regard this as an extension of quantum non-demolition measurements with potential applications in quantum metrology and quantum computing.

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Quantum nondemolition measurement of mechanical motion quanta

Cited by 25 publications

References 49 publications

Phonon-Number-Sensitive Electromechanics

Phonon-Number-Sensitive Electromechanics

Unconditional measurement-based quantum computation with optomechanical continuous variables

Quantum non-demolition measurements of moving target states

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