Quantum Non-demolition Measurements on Qubits

Details Quantum Non-demolition Measurements on Qubits Quantum Non-demolition Measurements on Qubits

2004-12-20

arxiv.org/abs/quant-ph/0412149v1

Phys.Rev.A73:012113,2006

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.73.012113

We discuss the characterization and properties of quantum non-demolition (QND) measurements on qubit systems. We introduce figures of merit which can be applied to systems of any Hilbert space dimension thus providing universal criteria for characterizing QND measurements. We discuss the controlled-NOT gate and an optical implementation as examples of QND devices for qubits. We also discuss the QND measurement of weak values.

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