55 citations
4 papers
Feedback cooling of atomic motion in cavity QED
Daniel A. Steck, Kurt Jacobs, Hideo Mabuchi +2
We consider the problem of controlling the motion of an atom trapped in an optical cavity using continuous feedback. In order to realize such a scheme experimentally, one must be a…
Adaptive Phase Measurements in Linear Optical Quantum Computation
T. C. Ralph, A. P. Lund, H. M. Wiseman
Photon counting induces an effective nonlinear optical phase shift on certain states derived by linear optics from single photons. Although this no nlinearity is nondeterministic,…
States for phase estimation in quantum interferometry
Joshua Combes, H. M. Wiseman
Ramsey interferometry allows the estimation of the phase of rotation of the pseudospin vector of an ensemble of two-state quantum systems. For small, the noise-to-signal ra…
Entanglement under restricted operations: Analogy to mixed-state entanglement
Stephen D. Bartlett, Andrew C. Doherty, Robert W. Spekkens +1
We show that the classification of bi-partite pure entangled states when local quantum operations are restricted yields a structure that is analogous in many respects to that of mi…