Physics – Quantum Physics
Scientific paper
2003-02-13
Topic Review in JMO 51, 1559-1601 (2004)
Physics
Quantum Physics
25 pages, 14 figures
Scientific paper
We develop a theoretical framework for the exploration of quantum mechanical coherent population transfer phenomena, with the ultimate goal of constructing faithful models of devices for classical and quantum information processing applications. We begin by outlining a general formalism for weak-field quantum optics in the Schr\"{o}dinger picture, and we include a general phenomenological representation of Lindblad decoherence mechanisms. We use this formalism to describe the interaction of a single stationary multilevel atom with one or more propagating classical or quantum laser fields, and we describe in detail several manifestations and applications of electromagnetically induced transparency. In addition to providing a clear description of the nonlinear optical characteristics of electromagnetically transparent systems that lead to ``ultraslow light,'' we verify that -- in principle -- a multi-particle atomic or molecular system could be used as either a low power optical switch or a quantum phase shifter. However, we demonstrate that the presence of significant dephasing effects destroys the induced transparency, and that increasing the number of particles weakly interacting with the probe field only reduces the nonlinearity further. Finally, a detailed calculation of the relative quantum phase induced by a system of atoms on a superposition of spatially distinct Fock states predicts that a significant quasi-Kerr nonlinearity and a low entropy cannot be simultaneously achieved in the presence of arbitrary spontaneous emission rates. Within our model, we identify the constraints that need to be met for this system to act as a one-qubit and a two-qubit conditional phase gate.
Beausoleil Raymond G.
Munro William J.
Spiller Tim P.
No associations
LandOfFree
Applications of Coherent Population Transfer to Quantum Information Processing does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Applications of Coherent Population Transfer to Quantum Information Processing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Applications of Coherent Population Transfer to Quantum Information Processing will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-267633