Feedback-Enhanced Parametric Squeezing of Mechanical Motion

We present a single-quadrature feedback scheme able toovercome the conventional 3 dB limit on parametric squeezing. The method is experimentally demonstrated in a micromechanical system based on a cantilever with a magnetic tip. The cantilever is detected at low temperature by a SQUID susceptometer, while parametric pumping is obtained by modulating the magnetic field gradient at twice the cantilever frequency. A maximum squeezing of 11.5 dB and 11.3 dB is observed, respectively, in the response to a sinusoidal test signal and in the thermomechanical noise. So far, the maximum squeezing factor is limited only by the maximum achievable parametric modulation. The proposed technique might be used to squeeze one quadrature of a mechanical resonator below the quantum noise level, even without the need for a quantum limited detector.

Feedback-Enhanced Parametric Squeezing of Mechanical Motion / Vinante, A; Falferi, P. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 111:20(2013). [10.1103/PhysRevLett.111.207203]

Titolo: Feedback-Enhanced Parametric Squeezing of Mechanical Motion
Autori: Vinante, A; Falferi, P
Autori Unitn: 
Vinante, Andrea
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Titolo del periodico: PHYSICAL REVIEW LETTERS
Anno di pubblicazione: 2013
Numero e parte del fascicolo: 20
Codice identificativo WOS: WOS:000327244000003
Digital Object Identifier (DOI): http://dx.doi.org/10.1103/PhysRevLett.111.207203
Handle: http://hdl.handle.net/11572/343864
Citazione: Feedback-Enhanced Parametric Squeezing of Mechanical Motion / Vinante, A; Falferi, P. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 111:20(2013). [10.1103/PhysRevLett.111.207203]
Appare nelle tipologie:03.1 Articolo su rivista (Journal article)

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