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Concurrence (quantum computing)
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Concurrence (quantum computing) : ウィキペディア英語版
Concurrence (quantum computing)
In quantum information science, the concurrence is a state invariant involving qubits.
==Definition==
the concurrence is an entanglement monotone defined for a mixed state of two qubits as:〔〔〔〔
: \mathcal(\rho)\equiv\max(0,\lambda_1-\lambda_2-\lambda_3-\lambda_4)
in which \lambda_1,...,\lambda_4 are the eigenvalues, in decreasing order, of the Hermitian matrix
:R = \sqrt\sqrt}
with
:\tilde = (\sigma_\otimes\sigma_)\rho^(\sigma_\otimes\sigma_)
the spin-flipped state of \rho, \sigma_y a Pauli spin matrix, and the eigenvalues listed in decreasing order.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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