Entanglement and State Preparation

Details Entanglement and State Preparation Entanglement and State Preparation

1999-01-26

arxiv.org/abs/quant-ph/9901071v2

Physics

Quantum Physics

24 pages, 3 figures, submitted to Phys. Rev. A

Scientific paper

10.1103/PhysRevA.61.022311

When a subset of particles in an entangled state is measured, the state of the subset of unmeasured particles is determined by the outcome of the measurement. This first measurement may be thought of as a state preparation for the remaining particles. In this paper, we examine how the duration of the first measurement effects the state of the unmeasured subsystem. The state of the unmeasured subsytem will be a pure or mixed state depending on the nature of the measurement. In the case of quantum teleportation we show that there is an eigenvalue equation which must be satisfied for accurate teleportation. This equation provides a limitation to the states that can be accurately teleported.

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