Entanglement of a Pair of Quantum Bits

1997/06/30 by Scott Hill, William K. Wootters · 65 citations
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum Computing Algorithms and Architecture

paper · doi:10.1103/physrevlett.78.5022

Abstract

The ``entanglement of formation'' of a mixed state \ensuremathρ of a bipartite quantum system can be defined as the minimum number of singlets needed to create an ensemble of pure states that represents \ensuremathρ. 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.

Citations

• Separability Criterion for Density Matrices
• Quantifying Entanglement

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