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OPTOMECHANICAL COOLING AND AMPLIFICATION IN A CHIP-SCALE INTEGRATED CIRCUIT Hong Tang Yale <strong>University</strong> I will describe our efforts in developing integrated circuits of cavity optomechanics on a silicon compatible chip. A progressive path for scaling optomechanical structures to smaller size, higher frequency and stronger coupling will be presented. We will show several promising applications stemming out on-chip cooling and amplification functions. 22
CIRCUIT CAVITY ELECTROMECHANICS IN THE STRONG COUPLING REGIME John Teufel NIST – Boulder In the longstanding endeavor to access the quantum nature of macroscopic mechanical motion, the experimental challenge is not only that of state preparation, but also one of measurement. The flourishing field of cavity opto- and electro-mechanics, in which an electromagnetic resonance couples parametrically to a mechanical oscillator, addresses both of these challenges— providing a nearly ideal architecture for both manipulation and detection of mechanical motion at the quantum level. In this talk, I present experiments in which the motion of a high-Q, micromechanical membrane couples to a superconducting microwave resonator. When the circuit is excited with a coherent microwave tone near the cavity resonance, the displacement of the oscillator becomes encoded as modulation of this tone. The microwaves, in turn, also impart forces back on the oscillator which enforce the Heisenberg limits on measurement, and can also be exploited to either cool or amplify the motion. The unprecedented electromechanical coupling strength allows the driven system to enter the strong- coupling regime, where the normal modes are now hybrids of the original radio-frequency mechanical and the microwave electrical resonances. This normal-mode splitting is verified by direct spectroscopy of the ‘dressed states’ of the hybridized cavity resonance, showing excellent agreement with theoretical predictions. As all of these experiments take place in at a temperature below 40 mK, this system operates in the quantum enabled regime where the thermal decoherence rate is small enough to allow sideband cooling of the mechanical mode to the ground state. By measuring the noise spectrum of this mechanical system with a nearly quantum-limited microwave amplifier, the residual thermal motion of the oscillator is easily resolvable above the measurement imprecision. The <strong>final</strong> part of this talk will quantify the thermal motion of the oscillator as it is cooled with radiation-pressure forces to below its quantum zero-point motion and enters the strong coupling regime. 23
Page 1 and 2: Table of Contents WORKSHOP SCHEDULE
Page 3 and 4: Schedule MONDAY, FEBRUARY 7 Phillip
Page 5 and 6: JAMIL ABO-SHAEER PARTICIPANTS Darpa
Page 7 and 8: MONIKA SCHLEIER-SMITH SWATI SINGH P
Page 9 and 10: TOWARDS QUANTUM SUPERPOSITIONS OF A
Page 11 and 12: LINEAR AND QUADRATIC OPTOMECHANICS
Page 13 and 14: OPTOMECHANICS OF A QUANTUM DEGENERA
Page 15 and 16: NONLINEAR OPTOMECHANICS: QUADRATIC
Page 17 and 18: THE PHOTON BLOCKADE EFFECT IN OPTOM
Page 19 and 20: OPTOMECHANICAL MATTER-WAVE INTERFER
Page 21: CAVITY OPTOMECHANICS: BEYOND THE GR
Page 25 and 26: RADIATION PRESSURE AND QUANTUM NOIS
Page 27 and 28: ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !

Index OMC_final - Harvard University

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