Superconducting microresonators: physics and applications. Nanowire superinductance fluxonium qubit. Atomic layer deposition of titanium nitride for quantum circuits. Ultrasonic attenuation due to grain boundary scattering in pure niobium. Attenuation and scattering of high frequency sound waves in metals and glasses. Circuit cavity electromechanics in the strong-coupling regime. Electrical driving of X-band mechanical waves in a silicon photonic circuit. Measurements of nanoresonator-qubit interactions in a hybrid quantum electromechanical system. Quantum electromechanics of a hypersonic crystal. Ultrastrong parametric coupling between a superconducting cavity and a mechanical resonator. Sideband cooling of micromechanical motion to the quantum ground state. A perspective on hybrid quantum opto- and electromechanical systems. Superconducting qubit to optical photon transduction. Mirhosseini, M., Sipahigil, A., Kalaee, M. Loss channels affecting lithium niobate phononic crystal resonators at cryogenic temperature. ![]() Quantum state preparation and tomography of entangled mechanical resonators. Parity measurement in the strong dispersive regime of circuit quantum acoustodynamics. Quantum control of surface acoustic-wave phonons. Wallucks, A., Marinković, I., Hensen, B., Stockill, R. Microwave-optical quantum frequency conversion. Controlling phonons and photons at the wavelength scale: integrated photonics meets integrated phononics. Hybrid quantum systems with circuit quantum electrodynamics. Nano-acoustic resonator with ultralong phonon lifetime. Strained crystalline nanomechanical resonators with quality factors above 10 billion. Measurements of the mechanical Q of single-crystal silicon at low temperatures. Simultaneously achieving ground-state operation, long mechanical lifetimes and strong coupling sets the stage for employing silicon electromechanical devices in hybrid quantum systems and as a tool for studying the origins of acoustic loss in the quantum regime. Despite using strong electrostatic fields, we find the cavity mechanics system in the quantum ground state, verified by thermometry measurements. In our best devices, we measure mechanical quality factors approaching Q ≈ 10 7, measured at low-phonon numbers and millikelvin temperatures. Relying on a driving scheme based on electrostatic fields and the kinetic inductance effect in disordered superconductors, we demonstrate a parametrically enhanced electromechanical coupling of g/2π = 1.1 MHz, sufficient to enter the strong-coupling regime with a cooperativity of \(\). ![]() Here we present a non-piezoelectric silicon electromechanical system capable of operating in the gigahertz frequency band. The integration of piezoelectric materials is one approach to introducing electrical control, but the challenges of combining heterogeneous materials lead to severely limited phonon lifetimes. Quantum electrical control of such long-lived mechanical oscillators would enable the development of phononic memory elements, sensors and transducers. Probe fundamental physics.In single crystals, the suppression of intrinsic loss channels at low temperatures leads to exceptionally long mechanical lifetimes. Innovative laser technology are revolutionizing the performance of atomicĬlocks and metrology, providing opportunities to explore emerging phenomena and Precise quantum state engineering, many-body physics, and His recent 2022 honors include Breakthrough Prize in Fundamental Physics, Niels Bohr Institute Medal of Honour, Herbert Walther Award, and Among his awards and honors are 4 Gold Medals from the Commerce Department, N.F. He has co-authored overĤ00 scientific papers and delivered 600 invited talks. His research focuses on the development of new tools for light-matter interactions and their applications in precision measurement, quantum science, and frequency metrology. Jun Ye is a Fellow of JILA, a Fellow of NIST, and a member of the National Academy of Sciences.
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