Quantum Backaction Evading Measurement of Collective Mechanical Modes
Quantum Backaction Evading Measurement of Collective Mechanical Modes
The standard quantum limit constrains the precision of an oscillator position measurement. It arises from a balance between the imprecision and the quantum back-action of the measurement. However, a measurement of only a single quadrature of the oscillator can evade the back-action and be made with arbitrary precision. Here we …