Parity measurement in the strong dispersive regime of circuit quantum acoustodynamics

Lüpke, Uwe von; Yang, Yu; Bild, Marius; Michaud, Laurent; Fadel, Matteo; Chu, Yiwen

doi:10.1038/s41567-022-01591-2

Cited by 50 publications

(47 citation statements)

References 34 publications

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“…These qualities, together with rapid advances in nanofabrication, have provided the impetus for much recent progress, including nanomechanical computers built from metamaterials [12,14] and DNA-origami [15,16], emulation of emergent phenomena such as ferromagnetism [17] and symmetry breaking [18], and reversible mechanical computing [19]. Nanomechanical elements are now even being applied as memories and interfaces for quantum computers [20][21][22]. However, scaling nanomechanical gates into complex circuits remains an outstanding challenge.…”

Section: Introductionmentioning

confidence: 99%

Scalable nanomechanical logic gate

Romero¹,

Mauranyapin²,

Hirsch³

et al. 2022

Preprint

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Nanomechanical computers promise robust, low energy information processing. However, to date, electronics have generally been required to interconnect gates, while no scalable, purely nanomechanical approach to computing has been achieved. Here, we demonstrate a nanomechanical logic gate in a scalable architecture. Our gate uses the bistability of a nonlinear mechanical resonator to define logical states. These states are efficiently coupled into and out of the gate via nanomechanical waveguides, which provide the mechanical equivalent of electrical wires. Crucially, the input and output states share the same spatiotemporal characteristics, so that the output of one gate can serve as the input for the next. Our architecture is CMOS compatible, while realistic miniaturisation could allow both gigahertz frequencies and an energy cost that approaches the fundamental Landauer limit. Together this presents a pathway towards large-scale nanomechanical computers, as well as neuromorphic networks able to simulate computationally hard problems and interacting many-body systems.

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Section: Introductionmentioning

confidence: 99%

Scalable nanomechanical logic gate

Romero¹,

Mauranyapin²,

Hirsch³

et al. 2022

Preprint

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“…The acoustic lattice oscillations are localized within a Gaussian mode with waist w 0 = 27 µm and length L = 435 µm, giving a mode volume of πw 2 0 L ≈ 0.001 mm 3 (see supplementary materials 18 , section B for details). More details about this circuit quantum acoustodynamics (cQAD) system 19 and the device 20 can be found in previous works.…”

mentioning

confidence: 99%

“…We displace the phonon mode with a resonant drive of amplitude A to a coherent state with amplitude α. To mitigate any effect of the drive on the qubit state, we then cool the qubit with an ancillary phonon mode 19,20 . The qubit is subsequently prepared in its initial state by applying a drive pulse with variable phase and amplitude.…”

mentioning

confidence: 99%

“…We now focus on the time evolution of the phonon subsystem by performing full Wigner tomography of the phonon state after the resonant interaction times t = 0, 2.9 and 7.0 µs. To this end, we use the parity measurement technique established in a previous work 20 . To compensate for the effect of qubit dephasing during the parity measurement, we normalize all measured parity values to that of the Fock |0 phonon state (see supplementary materials 18 , section C).…”

mentioning

confidence: 99%

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Schrödinger cat states of a 16-microgram mechanical oscillator

Bild¹,

Fadel²,

Yu³

et al. 2022

Preprint

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The superposition principle is one of the most fundamental principles of quantum mechanics. According to the Schrödinger equation, a physical system can be in any linear combination of its possible states. While 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 with an effective mass of 16.2 micrograms in Schrödinger cat states of motion, where the constituent atoms are in a superposition of oscillating with two opposite phases. We show control over the size and phase of the superposition and investigate the decoherence dynamics of these states. Apart from shedding light at the boundary between the quantum and the classical world, our results are of interest for quantum technologies, as they pave the way towards continuous-variable quantum information processing and quantum metrology with mechanical resonators.

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“…In the gigahertz frequency range, where the spectral proximity to superconducting qubits holds the most promise for quantum technologies, piezoelectricity is the predominant mechanism for converting microwave photons to phonons. Piezoelectric devices have been used with remarkable success in coupling mechanical modes to superconducting qubits [9][10][11]. However, their need for hybrid material integration, sophisticated fabrication process, and reliance on lossy poly-crystalline materi- * mohmir@caltech.edu; http://qubit.caltech.edu als [12] has limited the state-of-the-art experiments to sub-microseconds mechanical lifetimes in devices with compact geometries [11,13].…”

mentioning

confidence: 99%

A quantum electromechanical interface for long-lived phonons

Bozkurt¹,

Han²,

Joshi³

et al. 2022

Preprint

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Controlling long-lived mechanical oscillators in the quantum regime holds promises for quantum information processing. Here, we present an electromechanical system capable of operating in the GHz-frequency band in a silicon-on-insulator platform. Relying on a novel driving scheme based on an electrostatic field and high-impedance microwave cavities based on TiN superinductors, we are able to demonstrate a parametrically-enhanced electromechanical coupling of g/2π = 1.1 MHz, sufficient to enter the strong-coupling regime with a cooperativity of C = 1200. The absence of piezoelectric materials in our platform leads to long mechanical lifetimes, finding intrinsic values up to τ d = 265 µs (Q = 8.4 × 10 6 at ωm/2π = 5 GHz) measured at low-phonon numbers and millikelvin temperatures. Despite the strong parametric drives, we find the cavity-mechanics system in the quantum ground state by performing sideband thermometry measurements. Simultaneously achieving ground-state operation, long mechanical lifetimes, and strong coupling sets the stage for employing silicon electromechanical resonators as memory elements and transducers in hybrid quantum systems, and as a tool for probing the origins of acoustic loss in the quantum regime.

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Parity measurement in the strong dispersive regime of circuit quantum acoustodynamics

Cited by 50 publications

References 34 publications

Scalable nanomechanical logic gate

Scalable nanomechanical logic gate

Schrödinger cat states of a 16-microgram mechanical oscillator

A quantum electromechanical interface for long-lived phonons

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