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26 April 2024

» arxiv » 1003.3752

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Measuring nanomechanical motion with an imprecision far below the standard quantum limit
G. Anetsberger ; E. Gavartin ; O. Arcizet ; Q. P. Unterreithmeier ; E. M. Weig ; M. L. Gorodetsky ; J. P. Kotthaus ; T. J. Kippenberg ;
Date:	19 Mar 2010
Abstract:	We demonstrate a transducer of nanomechanical motion based on cavity enhanced optical near-fields capable of achieving a shot-noise limited imprecision more than 10 dB below the standard quantum limit (SQL). Residual background due to fundamental thermodynamical frequency fluctuations allows a total imprecision 3 dB below the SQL at room temperature (corresponding to 600 am/Hz^(1/2) in absolute units) and is known to reduce to negligible values for moderate cryogenic temperatures. The transducer operates deeply in the quantum backaction dominated regime, prerequisite for exploring quantum backaction, measurement-induced squeezing and accessing sub-SQL sensitivity using backaction evading techniques.
Source:	arXiv, 1003.3752
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