Back action evasion in optical lever detection
- URL: http://arxiv.org/abs/2212.08197v1
- Date: Thu, 15 Dec 2022 23:43:15 GMT
- Title: Back action evasion in optical lever detection
- Authors: Shan Hao and Thomas Purdy
- Abstract summary: In general, any precision optical measurement is accompanied by optical force induced disturbance leading to a standard quantum limit(mechanical)
Here we give a simple description of how such back action can be evaded in optical lever detection to beat the quantum limit.
We achieve a readout noise floor two orders of magnitude lower than the quantum limit.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The optical lever is a centuries old and widely-used detection technique
employed in applications ranging from consumer products, industrial sensors to
precision force microscopes used in scientific research. However, despite the
long history, its quantum limits have yet to be explored. In general, any
precision optical measurement is accompanied by optical force induced
disturbance to the measured object (termed as back action) leading to a
standard quantum limit(SQL). Here we give a simple description of how such back
action can be evaded in optical lever detection to beat SQL. We perform a
proof-of-principle experiment demonstrating the mechanism of back action
evasion in the classical regime, by developing a lens system that cancels extra
tilting of the reflected light off a silicon nitride membrane mechanical
resonator caused by laser-pointing-noise-induced optical torques. We achieve a
readout noise floor two orders of magnitude lower than the SQL, corresponding
to an effective optomechanical cooperativity of 100 without the need for an
optical cavity. As the state-of-the-art ultra low dissipation optomechanical
systems relevant for quantum sensing are rapidly approaching the level where
quantum noise dominates, simple and widely applicable back action evading
protocols such as ours will be crucial for pushing beyond quantum limits.
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