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Purification of Noisy Measurements and Faithful Distillation of Entanglement
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We consider entanglement distillation with noisy operations in which quantum measurements that constitute a general quantum operation are particularly noisy. We present a protocol for purifying noisy measurements and show that imperfect local operations can distill entanglement. The protocol works for arbitrary noisy measurements in general and is cost-effective and resource-efficient with single additional qubit per party to resolve the distillation of entanglement. The purification protocol is feasible with currently available quantum technologies and readily applied to entanglement applications.
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Protocol for Purifying Noisy Preparation and Measurements of Qubits
Noisy qubit preparation and measurement can be distilled to near-zero error by repeating the noisy SPAM round with extra ancilla qubits, achieving 10^-3 with two ancillas and 10^-6 with four.
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