Quantum Information

Set, exchange, measure, repeat

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Science  19 Jun 2020:
Vol. 368, Issue 6497, pp. 1325-1326
DOI: 10.1126/science.368.6497.1325-f

Successful protocols for quantum information processing and quantum computation depend on the reliable storage and manipulation of the quantum state of a qubit. Qubits, however, are prone to errors because complete isolation from the environment is not possible. Methods for correcting these errors must also contend with the fact that direct measurement of a qubit destroys it. Xue et al. describe a repetitive quantum nondemolition method on a two-qubit system in which the state of the main qubit is mapped onto a second qubit that acts as an ancilla. Repeated measurement of the ancilla qubit allows the main qubit to be maintained and read out with higher fidelity. Such a protocol provides a route to robust quantum information processing in solid-state systems.

Phys. Rev. X 10, 021006 (2020).

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