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arXiv:quant-ph/0402184 · Journal of Modern Optics

Entanglement purification through Zeno-like measurements

Kazuya Yuasa, Hiromichi Nakazato, Makoto Unoki

Published Apr 1, 2004• 2 citations
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Abstract

We present a novel method for purifying quantum states, i.e. purification through Zeno-like measurements, and show an application to entanglement purification.
DOI
10.1080/09500340408233616

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We present a novel procedure to purify quantum states, i.e., purification through Zeno-like measurements. By simply repeating one and the same measurement on a quantum system, one can purify another system in interaction with the former. The conditions for the (efficient) purification are specified on a rather general setting, and the framework of the method possesses wide applicability. It is explicitly demonstrated on a specific setup that the purification becomes very efficient by tuning relevant parameters.
A 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.