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Optimal purification of single qubits

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arxiv quant-ph/9812075 v1 pith:LG72OL65 submitted 1998-12-26 quant-ph

J. I. Cirac , A. K. Ekert , C. Macchiavello This is my paper · ORCID
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keywords optimaldecompositionpurificationsinglestatesallowscloningconstruct
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abstract

We introduce a new decomposition of the multiqubit states of the form $\rho^{\otimes N}$ and employ it to construct the optimal single qubit purification procedure. The same decomposition allows us to study optimal quantum cloning and state estimation of mixed states.

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  1. A distillation-teleportation protocol for fault-tolerant QRAM

    quant-ph 2025-05 accept novelty 8.0 of 10

    An adaptive distillation-teleportation protocol implements a fault-tolerant QRAM query with poly(n) quantum resources and 1/poly(n) device fidelity, at the cost of an exponential classical dataset update each round.

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