Preparation and Entanglement Purification of Qubits through Zeno-like Measurements

Details Preparation and Entanglement Purification of Qubits through Zeno-like Measurements Preparation and Entanglement Purification of Qubits through Zeno-like Measurements

2004-02-25

arxiv.org/abs/quant-ph/0402182v3

Phys. Rev. A 70 (2004) 012303

Physics

Quantum Physics

12 pages, 9 figures; minor revision on a reference; the version accepted for publication in PRA

Scientific paper

10.1103/PhysRevA.70.012303

A novel method of purification, purification through Zeno-like measurements [H. Nakazato, T. Takazawa, and K. Yuasa, Phys. Rev. Lett. 90, 060401 (2003)], is discussed extensively and applied to a few simple qubit systems. It is explicitly demonstrated how it works and how it is optimized. As possible applications, schemes for initialization of multiple qubits and entanglement purification are presented, and their efficiency is investigated in detail. Simplicity and flexibility of the idea allow us to apply it to various kinds of settings in quantum information and computation, and would provide us with useful and practical methods of state preparation.

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