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Approximate Quantum Error Correction Revisited: Introducing the Alphabit. (arXiv:1706.09434v1 [quant-ph])
来源于:arXiv
We establish that, in an appropriate limit, qubits of communication should be
regarded as composite resources, decomposing cleanly into independent
correlation and transmission components. Because qubits of communication can
establish ebits of entanglement, qubits are more powerful resources than ebits.
We identify a new communications resource, the zero-bit, which is precisely
half the gap between them; replacing classical bits by zero-bits makes
teleportation asymptotically reversible. The decomposition of a qubit into an
ebit and two zero-bits has wide-ranging consequences including applications to
state merging, the quantum channel capacity, entanglement distillation, quantum
identification and remote state preparation. The source of these results is the
theory of approximate quantum error correction. The action of a quantum channel
is reversible if and only if no information is leaked to the environment, a
characterization that is useful even in approximate form. However, differen 查看全文>>