Broadband Back Action Cancellation in a Dichromatic Variational Measurement
arXiv:2105.02506
Abstract
Quantum back action imposes fundamental sensitivity limits to the majority of quantum measurements. The effect results from the unavoidable contamination of the measured parameter with the quantum noise of a meter. Back action evading measurements take advantage of the quantum correlations introduced by the system under study to the meter and allow overcoming the fundamental limitations. The measurements are frequently restricted in their bandwidth due to a finite response time of the system components. Here we show that probing a mechanical oscillator with a dichromatic field with frequencies separated by the oscillator frequency enables independent detection and complete subtraction of the measurement noise associated with the quantum back action.
6 pages, 1 figure
References in corpus (7)
- Testing the limits of quantum mechanical superpositions
- Back-action evasion and squeezing of a mechanical resonator using a cavity detector
- Perspectives on quantum transduction
- Ultrasensitive torque detection with an optically levitated nanorotor
- Quantum back action evading measurement of motion in a negative mass reference frame
- Approaching the Standard Quantum Limit of Mechanical Torque Sensing
- On sensitivity limitations of a dichromatic optical detection of a classical mechanical force