Guofeng Zhang

On Realization of Back‐Action‐Evading Measurements and Quantum Non‐Demolition Variables via Linear Systems Engineering

ABSTRACT We establish a framework for realizing back‐action‐evading (BAE) measurements and quantum non‐demolition (QND) variables in linear quantum systems. The key condition, a purely imaginary Hamiltonian matrix with a real or imaginary coupling operator matrix, enables BAE mea...