Measuring nanomechanical motion with an imprecision below the standard quantum limit

被引：133

作者：

Anetsberger, G. ^{[1
]}

Gavartin, E. ^{[2
]}

Arcizet, O. ^{[1
]}

Unterreithmeier, Q. P. ^{[3
,4
]}

Weig, E. M. ^{[3
,4
]}

Gorodetsky, M. L. ^{[5
]}

Kotthaus, J. P. ^{[3
,4
]}

Kippenberg, T. J. ^{[1
,2
]}

机构：

[1] Max Planck Inst Quantum Opt, D-85748 Garching, Germany

[2] Ecole Polytech Fed Lausanne, CH-1015 Lausanne, Switzerland

[3] Univ Munich, Fak Phys, D-80539 Munich, Germany

[4] Univ Munich, Ctr NanoSci CeNS, D-80539 Munich, Germany

[5] Moscow MV Lomonosov State Univ, Dept Phys, RU-119899 Moscow, Russia

来源：

PHYSICAL REVIEW A | 2010年 / 82卷 / 06期

关键词：

NOISE; CAVITY; RESONATOR;

D O I：

10.1103/PhysRevA.82.061804

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report a room-temperature measurement of nanomechanical motion with an imprecision below the standard quantum limit (SQL), using cavity-enhanced optical near fields. Fundamental thermodynamical cavity frequency fluctuation limits the total imprecision to 3 dB below the SQL at room temperature [corresponding to (530 am/root Hz)(2) in absolute units] and is expected to reduce to negligible values at moderate cryogenic temperatures. Coupling strengths exceeding those required to reach the SQL by more than two orders of magnitude are achieved, allowing a shot-noise limited imprecision more than 10 dB below the SQL. The transducer, thus, in principle, allows access to the quantum backaction dominated regime, a prerequisite for exploring quantum backaction, measurement-induced squeezing, and obtaining sub-SQL sensitivity using backaction evading techniques.

引用

页数：4

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