Direct evaluation of measurement uncertainties by feedback compensation of decoherence

Keywords of this research results

  • Quantum Measurement
  • Quantum Information


It is difficult to determine the precision of a quantum measurement since the unavoidable disturbance of the state by the measurement eliminates information that may have been available before the measurement. In this paper, it is shown that the precision of a measurement outcome can be evaluated by compensating the effects of fluctuations in a weak interaction with a quantum probe before the measurement. The result indicate that the precise values of physical properties depend on the manner in which they are measured.