Entanglement of a Pair of Quantum Bits

Sam A. Hill and William K. Wootters
Phys. Rev. Lett. 78, 5022 – Published 30 June 1997
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Abstract

The “entanglement of formation” of a mixed state ρ of a bipartite quantum system can be defined as the minimum number of singlets needed to create an ensemble of pure states that represents ρ. We find an exact formula for the entanglement of formation for all mixed states of two qubits having no more than two nonzero eigenvalues, and we report evidence suggesting that the formula is valid for all states of this system.

  • Received 3 March 1997

DOI:https://doi.org/10.1103/PhysRevLett.78.5022

©1997 American Physical Society

Authors & Affiliations

Sam A. Hill and William K. Wootters

  • Department of Physics, Williams College, Williamstown, Massachusetts 01267

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Issue

Vol. 78, Iss. 26 — 30 June 1997

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