Short-time-interaction quantum measurement through an incoherent mediator
Jorge Casanova, Guillermo Romero, I. Lizuain, J. C. Retamal, Christian F. Roos, Juan Gonzalo Muga, E. Solano · Physical Review A · 2010
We propose a method of indirect measurements where a probe is able to read, in short interaction times, the quantum state of a remote system through an incoherent third party, hereafter called a mediator. The probe and system can interact briefly with the mediator in an incoherent state but not directly among themselves and, nevertheless, the transfer of quantum information can be achieved with robustness. We exemplify our measurement scheme with a paradigmatic example of this tripartite problem---a qubit-oscillator-qubit setup---and discuss different physical scenarios, pointing out the associated advantages and limitations.