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Circuit Cavity Electromechanics in the Quantum Regime


Lei, Chan U (2017) Circuit Cavity Electromechanics in the Quantum Regime. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/Z93T9F6W.


Generating nonclassical states of a macroscopic mechanical object has been a subject of considerable interest. It offers a route toward fundamental test of quantum mechanics in an unexplored regime. However, a macroscopic quantum state is very susceptible to decoherence due to the environment. One way to generate robust quantum states is quantum reservoir engineering. In this work, we utilize the reservoir engineering scheme to generate a steady quantum squeezed state of a micron-scale mechanical oscillator in an electromechanical system. Together with the backaction evading measurement technique, we demonstrate a quantum nondemolition measurement of the mechanical quadratures to characterize the quantum squeezed state. By measuring the quadrature variances of the mechanical motion, more than 3dB squeezing below the zero-point level has been achieved.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:optomechanics, electromechanics, macroscopic quantum phenomena, quantum physics, low temperature physics, nanofabrication
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Schwab, Keith C.
Group:Institute for Quantum Information and Matter, Kavli Nanoscience Institute
Thesis Committee:
  • Schwab, Keith C. (chair)
  • Chen, Yanbei
  • Adhikari, Rana
  • Faraon, Andrei
Defense Date:10 October 2016
Record Number:CaltechTHESIS:10182016-152744850
Persistent URL:
Lei, Chan U0000-0002-2790-2421
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9943
Deposited By: Chan U Lei
Deposited On:24 Oct 2016 19:52
Last Modified:02 Jun 2020 21:46

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