Quantum trajectories for environment in superposition of coherent states

Abstract

We derive stochastic master equations for a quantum system interacting with a Bose field prepared in a superposition of continuous-mode coherent states. To determine a conditional evolution of the quantum system we use a collision model with an environment given as an infinite chain of not interacting between themselves qubits prepared initially in a entangled state being a discrete analogue of a superposition of coherent states of the Bose field. The elements of the environment chain interact with the quantum system in turn one by one and they are subsequently measured. We determine a conditional evolution of the quantum system for continuous in time observations of the output field as a limit of discrete recurrence equations. We consider the stochastic master equations for a counting as well as for a diffusive stochastic process.

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Cited by in corpus (6)

• Quantum collision models: open system dynamics from repeated interactions
• Qubit models of weak continuous measurements
• Collision model for non-Markovian quantum trajectories
• Master equations and quantum trajectories for squeezed wave packets
• From a posteriori to a priori solutions for a two-level system interacting with a single-photon wavepacket
• Homodyne measurement with a Schrödinger cat state as a local oscillator