By Klaus Mølmer
Noise correlations in experiments played a pertinent role in the establishment of the non-classical properties of light. Glauber’s theory of photodetection and the master equation for light emitting quantum systems permit calculation of average signals and signal correlations, and for decades these theories formed the main curriculum of theoretical quantum optics (supplemented with occasional reference to the intuition of quantum jumps). With the development of quantum trajectory theory, we now track the dynamics of the state of individual, open quantum systems, conditioned on a real (or simulated) measurement record. This theory establishes a link between master equation theory and the general theory of quantum measurement and it fills a need for the modelling and control of such systems. After a brief review of the above concepts, I shall turn to a discussion of how the measurement back action in the quantum trajectories establishes a conditioned dynamics and hence not only an occasional, but a general connection with the correlation functions that we can obtain from master equations. Building on this insight, we shall go beyond Glauber and discuss less conventional, out-of-time-order correlation functions and experimental schemes that can measure them.
By Florian Marquardt
By Gary Steele
By Hendrik Bluhm
By Jean-Michel Raimond
By Alain Sarlette
By Sylvain Schwartz
By Sophia Economou
By Klaus Mølmer
By Howard M. Wiseman
By Michel Devoret
By Akira Furusawa
By Yanhong Xiao
By Alex Retzker
By Nicolas Didier
By Ivan Deutsch
By Mankei Tsang
By Aashish Clerk
By Valentina Parigi
By Rebing Wu
By Michael Biercuk
By Thomas Ayral
By Yassine Hamoudi
By Yassine Hamoudi
By Nana Liu
By Nana Liu
