Probing the environment of an inaccessible system by a qubit ancilla
Steve Campbell, Mauro Paternostro, Sougato Bose, M. S. Kim · Physical Review A · 2010
We study the conditions for probing the environment affecting an inaccessible system by means of continuous interaction and measurements performed only on a probe. The scheme exploits the statistical properties of the probe at its steady state and simple data postprocessing. Our results, highlighting the roles played by interaction and entanglement in this process, are both pragmatically relevant and fundamentally interesting.