Nonsymmetrized Correlations in Quantum Noninvasive Measurements
Nonsymmetrized Correlations in Quantum Noninvasive Measurements
A long-standing problem in quantum mesoscopic physics is which operator order corresponds to noise expressions like <I(-ω)I(ω)>, where I(ω) is the measured current at frequency ω. Symmetrized order describes a classical measurement while nonsymmetrized order corresponds to a quantum detector, e.g., one sensitive to either emission or absorption of photons. …