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Optimal estimation of joint parameters in phase space
M. G. Genoni, M. G. A. Paris, G. Adesso +3
We address the joint estimation of the two defining parameters of a displacement operation in phase space. In a measurement scheme based on a Gaussian probe field and two homodyne…
Complementarity and uncertainty relations for matter wave interferometry
K. -P. Marzlin, B. C. Sanders, P. L. Knight
We establish a rigorous quantitative connection between (i) the interferometric duality relation for which-way information and fringe visibility and (ii) Heisenberg's uncertainty r…
Spatial decoherence near metallic surfaces
R. Fermani, S. Scheel, P. L. Knight
We present a first-principles derivation of spatial atomic-sublevel decoherence near dielectric and metallic surfaces. The theory is based on the electromagnetic-field quantization…
Hot entanglement in a simple dynamical model
S. Scheel, J. Eisert, P. L. Knight +1
How mixed can one component of a bi-partite system be initially and still become entangled through interaction with a thermalized partner? We address this question here. In particu…
A family of exact eigenstates for a single trapped ion interacting with a laser field
H. Moya-Cessa, D. Jonathan, P. L. Knight
We show that, under certain combinations of the parameters governing the interaction of a harmonically trapped ion with a laser beam, it is possible to find one or more exact eigen…
Entanglement induced by a single-mode heat environment
M. S. Kim, J. Lee, D. Ahn +1
A thermal field, which frequently appears in problems of decoherence, provides us with minimal information about the field. We study the interaction of the thermal field and a quan…