Observation and Interpretation of Motional Sideband Asymmetry in a Quantum Electromechanical Device
| Autor: | Chan U Lei, Keith Schwab, A. Metelmann, A.A. Clerk, Emma E. Wollman, Junho Suh, A. J. Weinstein |
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| Rok vydání: | 2014 |
| Předmět: |
Electromagnetic field
Physics Quantum Physics Photon Condensed Matter - Mesoscale and Nanoscale Physics Sideband QC1-999 Quantum noise FOS: Physical sciences General Physics and Astronomy 01 natural sciences Noise (electronics) 010305 fluids & plasmas Quantum electrodynamics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Quantum Physics (quant-ph) 010306 general physics Ground state Quantum Quantum fluctuation |
| Zdroj: | Physical Review X, Vol 4, Iss 4, p 041003 (2014) |
| ISSN: | 2160-3308 |
| Popis: | Quantum electromechanical systems offer a unique opportunity to probe quantum noise properties in macroscopic devices, properties that ultimately stem from Heisenberg’s uncertainty relations. A simple example of this behavior is expected to occur in a microwave parametric transducer, where mechanical motion generates motional sidebands corresponding to the up-and-down frequency conversion of microwave photons. Because of quantum vacuum noise, the rates of these processes are expected to be unequal. We measure this fundamental imbalance in a microwave transducer coupled to a radio-frequency mechanical mode, cooled near the ground state of motion. We also discuss the subtle origin of this imbalance: depending on the measurement scheme, the imbalance is most naturally attributed to the quantum fluctuations of either the mechanical mode or of the electromagnetic field. |
| Databáze: | OpenAIRE |
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