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Quantum theory of optical feedback via homodyne detection.
We present a quantum theory of feedback in which the homodyne photocurrent alters the dynamics of the source cavity. To the nonlinear stochastic (Ito) evolution of the conditioned system state we add… Expand
Quantum theory of field-quadrature measurements.
The quantum effects on a cavity mode of the electromagnetic field caused by measuring one of its quadrature components is analyzed. We consider three measurement schemes: an intracavity… Expand
Quantum optical Fredkin gate.
- Physics, Medicine
- Physical review letters
- 1 May 1989
A simple optical model to realize a reversible, potentially error-free logic gate a Fredkin gate is discussed. The device dissipates no energy and makes use of the Kerr nonlinearity to produce… Expand
Quantum-mechanical model for continuous position measurements.
We present an idealized model for a sequence of position measurements, and we then take an appropriate limit in which the measurements become continuous. The measurements lead to fluctuations without… Expand
Effect of dissipation on quantum coherence.
The effect of dissipation on a macroscopic superposition of quantum states is studied with use of a Markovian master-equation approach. It is shown that a superposition of two states is reduced to a… Expand
Quantum and classical Liouville dynamics of the anharmonic oscillator.
- Medicine, Physics
- Physical review. A, General physics
We consider the dynamics of a quantum joint phase-space probability density in an exactly solvable model. The density is defined to be a true (i.e., positive) probability distribution for approximate… Expand
Squeezing via feedback.
We present the quantum theory of optical cavity feedback mediated by homodyne detection, with an arbitrary time delay. We apply this theory to a system with nonclassical dynamics, a sub-Poissonian… Expand
All-optical versus electro-optical quantum-limited feedback.
All-optical feedback can be effected by putting the output of a source cavity through a Faraday isolator and into a second cavity which is coupled to the source cavity by a nonlinear crystal. If the… Expand
Universal teleportation with a twist
We give a transfer theorem for teleportation based on twisting the entanglement measurement. This allows one to say what local unitary operation must be performed to complete the teleportation in any… Expand
Interpretation of quantum jump and diffusion processes illustrated on the Bloch sphere.
It is shown that the evolution of an open quantum system whose density operator obeys a Markovian master equation can in some cases be meaningfully described in terms of stochastic Schrodinger… Expand