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DY: Fachverband Dynamik und Statistische Physik

DY 13: Symposium: Strong Coupling in Solid State Quantum Systems (SYSC)

DY 13.4: Hauptvortrag

Dienstag, 12. März 2013, 11:00–11:30, H1

Quantum Coherent Coupling between a Mechanical Oscillator and an Optical Mode — Ewold Verhagen, Dalziel Wilson, Vivishek Sudhir, Nicolas Piro, Albert Schliesser, and •Tobias Kippenberg — EPFL, Institute for Condensed Matter Physics, CH-1015, Switzerland

Cavity quantum optomechanics is a rapidly developing field which concerns the radiation pressure coupling of optical and mechanical degrees of freedom [1]. Using on-chip micro-cavities that combine both optical and mechanical degrees of freedom in one and the same device [2], radiation pressure back-action of photons is shown to lead to effective cooling [3] of the mechanical oscillator mode predicted by Braginsky [4]. In our research this is reached using cryogenic He-3 buffer gas precooling to ca. 700 mK in conjunction with laser cooling, allowing cooling of micro-mechanical oscillator to only 1.7 quanta, implying the oscillator resides more than 1/3 of its time in ground state. Moreover it is possible in this regime to observe quantum coherent coupling in which the mechanical and optical mode hybridize and the coupling rate exceeds the mechanical and optical decoherence rate [5]. This accomplishment enables a range of quantum optical experiments, including state transfer from light to mechanics using the phenomenon of optomechanically induced transparency [6].
[1] T. J. Kippenberg and K. J. Vahala, Science (2008)
T. J. Kippenberg et al., Phys. Rev. Lett. (2005)
V. B. Braginsky et al., Phys. Lett. A (2002)
A. Schliesser et al., Nat. Phys. (2008)
E. Verhagen et al., Nature (2012)
S. Weis et al., Science (2010)