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The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meeting

Collective Spontaneous Emission and Tripartite Entanglement of Driven, Damped Atoms in Free Space

Ethan Stanifer, James Clemens

Published Jan 1, 2013• 0 citations
Publisher

Abstract

We calculate the bipartite and tripartite entanglement of three damped atoms in free space with one atom driven. There are two sources of the dipole-dipole coupling and collective spontaneous emission.
DOI
10.1364/cqo.2013.m6.11

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, We investigate tripartite entanglement in an open quantum system, specifically three qubits, all of which are damped, and one of which is driven. We address a systematic approach in calculating the entanglement of various bipartite splits using concurrence as a measure of entanglement Our calculations are based on a direct detection scheme (quantum jump method - with and without knowledge of which qubit jumps) that is a particular unravelling of the density matrix. Our results are unravelling dependent, but apply to applications of entanglement based on direct detection. We also calculate the ’Three-way tangle’ or ’Residual Entanglement’ for this system. We present calculations for a variety of driving and damping rates, and examine what decay rate is adequate for the system to be reduced to two qubits with a readout port. We also consider how knowledge (or not) of which qubit decays affects the entanglement.