Quantum repeaters based on entanglement purification

Physical Review A - Atomic, Molecular, and Optical Physics

Volumn 59, Issue 1, 1999, Pages 169-181

  Dur W ^a   Briegel, H J ^a,b   Cirac, J I ^a   Zoller, P ^a  

^a UNIVERSITY OF INNSBRUCK   (Austria)

^b UNIVERSITY OF CASTILLA LA MANCHA   (Spain)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0001255085     PISSN: 10502947     EISSN: 10941622     Source Type: Journal    
DOI: 10.1103/PhysRevA.59.169     Document Type: Article

References (33)

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24. A similar form as in Eq. (4) may be obtained for two-bit rotations with a corresponding isotropic noise function, although the calculation is more complicated. In particular, we have not yet been successful in giving proof in terms of a manifest parametrization-independent average over the invariant group manifold of SU(4). Isotropic noise in this case means that the depolarizing channel does not distinguish between the two qubits and acts on them in a symmetric way.
25. The twirl is realized by (random) one-qubit operations described by the error parameter (Formula presented) Since one can perform instead of the twirl followed by a C operation a joined two-qubit operation, which is described by a single error parameter (Formula presented) the error parameter (Formula presented) does not appear in formula (9), although the (noisy) depolarization is already included.
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