laboratoire pierre aigrain
électronique et photonique quantiques
laboratoire pierre aigrain

Séminaire, 25 Novembre 2013

Benjamin Huard (LPA, ENS)
Observing interferences between past and future quantum states in resonance fluorescence

In quantum physics, measurement results are random but their statistics
can be predicted at any time assuming some knowledge about the system in the past. Additional knowledge from a future measurement deeply changes these statistics and leads to purely quantum features. In particular conditioned average outcomes of a weak measurement, so-called weak values, were shown to go beyond the conventional range, give a way to directly measure complex values, and can be used to enhance the sensitivity of quantum meters. Recently, these concepts have been considered in the general case of open quantum systems where decoherence occurs. Then, what are the properties of weak values for the unavoidable measurement associated to decoherence, the one performed by the environment ? Here, we answer this question in the simplest open quantum system : a quantum bit in presence of a relaxation channel. We
continuously monitor the fluorescence emitted by a superconducting qubit
driven at resonance. Conditioned on initial preparation and final single
shot measurement outcome of the qubit state, we probe weak values
displaying all the above properties. The fluorescence signal exhibits
interferences between oscillations associated to past or future quantum
states. The measured data are in excellent agreement with a recently
developed formalism.