Quantum state preparation, tomography, and entanglement of mechanical oscillators

Abstract

Precisely engineered mechanical oscillators keep time, filter signals, and sense motion, making them an indispensable part of today's technological landscape. These unique capabilities motivate bringing mechanical devices into the quantum domain by interfacing them with engineered quantum circuits. Proposals to combine microwave-frequency mechanical resonators with superconducting devices suggest the possibility of powerful quantum acoustic processors. Meanwhile, experiments in several mechanical systems have demonstrated quantum state control and readout, phonon number resolution, and phonon-mediated qubit-qubit interactions. Currently, these acoustic platforms lack processors capable of controlling multiple mechanical oscillators' quantum states with a single qubit, and the rapid quantum non-demolition measurements of mechanical states needed for error correction. Here we use a superconducting qubit to control and read out the quantum state of a pair of nanomechanical resonators. Our device is capable of fast qubit-mechanics swap operations, which we use to deterministically manipulate the mechanical states. By placing the qubit into the strong dispersive regime with both mechanical resonators simultaneously, we determine the resonators' phonon number distributions via Ramsey measurements. Finally, we present quantum tomography of the prepared nonclassical and entangled mechanical states. Our result represents a concrete step toward feedback-based operation of a quantum acoustic processor.

13 pages, 4+5 figures

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Cited by in corpus (59)

• Mesoscopic physics of nanomechanical systems
• Developing a platform for linear mechanical quantum computing
• Massive quantum systems as interfaces of quantum mechanics and gravity
• Macroscopic quantum test with bulk acoustic wave resonators
• Nonlinear nanomechanical resonators approaching the quantum ground state
• Magnon squeezing by two-tone driving of a qubit in cavity-magnon-qubit systems
• Piezoelectric actuation for integrated photonics
• Perspectives on high-frequency nanomechanics, nanoacoustics, and nanophononics
• Phononic bath engineering of a superconducting qubit
• Single-Spin Readout and Quantum Sensing using Optomechanically Induced Transparency
• Engineering Phonon-Qubit Interactions using Phononic Crystals
• Nonlinear Sideband Cooling to a Cat State of Motion
• Effective temperature pulses in open quantum systems
• Macroscopic Bell state between a millimeter-sized spin system and a superconducting qubit
• Acoustic resonators above 100 GHz
• Instabilities near ultrastrong coupling in microwave optomechanical cavity
• Realization of versatile and effective quantum metrology using a single bosonic mode
• Quantum metrology with a continuous-variable system
• Deterministic multi-phonon entanglement between two mechanical resonators on separate substrates
• Determination of Multi-mode Motional Quantum States in a Trapped Ion System
• Design of a release-free piezo-optomechanical quantum transducer
• Autonomous Stabilization of Fock States in an Oscillator against Multiphoton Losses
• Fast Generation of High-Fidelity Mechanical Non-Gaussian States via Additional Amplifier and Photon Subtraction
• Tunable coupling of a quantum phononic resonator to a transmon qubit with flip-chip architecture
• Optomechanical self-organization in a mesoscopic atom array
• Nonclassical mechanical states in cavity optomechanics in the single-photon strong-coupling regime
• Mixing thermal coherent states for precision and range enhancement in quantum thermometry
• Coupling high-overtone bulk acoustic wave resonators via superconducting qubits
• Testing spontaneous wavefunction collapse with quantum electromechanics
• Thin-film quartz for high-coherence piezoelectric phononic crystal resonators
• Ultracoherent GHz Diamond Spin-Mechanical Lamb Wave Resonators
• Motional entanglement of remote optically levitated nanoparticles
• Digital homodyne and heterodyne detection for stationary bosonic modes
• Quantum acoustic Fano interference of surface phonons
• Thermally-induced qubit coherence in quantum electromechanics
• Orbital-Free Quasi-Density Functional Theory
• Minimally-diffracting quartz for ultra-low temperature surface acoustic wave resonators
• Optimal Phase-Insensitive Force Sensing with Non-Gaussian States
• Photon counting statistics in Gaussian bosonic networks
• Single-photon induced instabilities in a cavity electromechanical device
• Heralding entangled optical photons from a microwave quantum processor
• Decoherence of surface phonons in a quantum acoustic system
• Steady-state entanglement of interacting masses in free space through optimal feedback control
• Tsirelson inequalities: Detecting cheating and quantumness in a single framework
• Hybrid spin-phonon architecture for scalable solid-state quantum nodes
• Suppressing Acoustomigration and Temperature Rise for High-power Robust Acoustics
• Mechanical Squeezed-Fock Qubit: Towards Quantum Weak-Force Sensing
• Arbitrary high-fidelity binomial codes from multiphoton spin-boson interactions
• Prospects of cooling a mechanical resonator with a transmon qubit in c-QED setup
• Generation of bipartite mechanical cat state by performing projective Bell state measurement
• Advancements in Entangled Photon Pairs in 2D Van der Waals Materials for On-chip Quantum Applications
• Strongly driven cavity quantum electrodynamical-optomechanical hybrid system
• Gigahertz-frequency Lamb wave resonator cavities on suspended lithium niobate for quantum acoustics
• Direct estimation of arbitrary observables of an oscillator
• Loss Mechanisms in High-coherence Multimode Mechanical Resonators Coupled to Superconducting Circuits
• Generation of phonon quantum states and quantum correlations among single photon emitters in hexagonal boron nitride
• Quantum sensing magnonic number states using a bosonic mode as the probe
• Reservoir-Engineered Mechanical Cat States with a Driven Qubit
• Multimode Gaussian steady state engineering in optomechanical systems with a squeezed reservoir