Photonic Maxwell's Demon.
Physical review letters 116:5 (2016) 050401
Abstract:
We report an experimental realization of Maxwell's demon in a photonic setup. We show that a measurement at the few-photons level followed by a feed-forward operation allows the extraction of work from intense thermal light into an electric circuit. The interpretation of the experiment stimulates the derivation of an equality relating work extraction to information acquired by measurement. We derive a bound using this relation and show that it is in agreement with the experimental results. Our work puts forward photonic systems as a platform for experiments related to information in thermodynamics.Quantum Quasi-Zeno Dynamics: Transitions mediated by frequent projective measurements near the Zeno regime
arXiv ArXiv (2016)
Abstract:
Frequent observation of a quantum system leads to quantum Zeno physics, where the system evolution is constrained to states commensurate with the measurement outcome. We show that, more generally, the system can evolve between such states through higher-order virtual processes that pass through states outside the measurement subspace. We derive effective Hamiltonians to describe this evolution, and the dependence on the time between measurements. We demonstrate application of this phenomena to prototypical quantum many-body system examples, spin chains and atoms in optical lattices, where it facilitates correlated dynamical effects.Quantum correlations which imply causation
Scientific Reports Nature Publishing Group: Open Access Journals - Option C (2015)
Replicating the benefits of Deutschian closed timelike curves without breaking causality
npj Quantum Information Springer Nature 1:1 (2015) 15007
Introducing one-shot work into fluctuation relations
New Journal of Physics IOP Publishing 17:9 (2015) 095003