Quantum non-demolition measurements of a qubit coupled to a harmonic oscillator

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CHIROLLI, Luca, Guido BURKARD, 2009. Quantum non-demolition measurements of a qubit coupled to a harmonic oscillator. Available under: doi: 10.1103/PhysRevB.80.184509

@unpublished{Chirolli2009Quant-5168, title={Quantum non-demolition measurements of a qubit coupled to a harmonic oscillator}, year={2009}, doi={10.1103/PhysRevB.80.184509}, author={Chirolli, Luca and Burkard, Guido} }

application/pdf eng 2011-03-24T14:53:42Z Burkard, Guido Quantum non-demolition measurements of a qubit coupled to a harmonic oscillator deposit-license Chirolli, Luca Burkard, Guido 2009 Chirolli, Luca 2011-03-24T14:53:42Z We theoretically describe the weak measurement of a two-level system (qubit) and quantify the degree to which such a qubit measurement has a quantum non-demolition (QND) character. The qubit is coupled to a harmonic oscillator which undergoes a projective measurement. Information on the qubit state is extracted from the oscillator measurement outcomes, and the QND character of the measurement is inferred by the result of subsequent measurements of the oscillator. We use the positive operator value measurement (POVM) formalism to describe the qubit measurement. Two mechanisms lead to deviations from a perfect QND measurement: (i) the quantum fluctuations of the oscillator, and (ii) quantum tunneling between the qubit states |0i and |1> during measurements. Our theory can be applied to QND measurements performed on superconducting qubits coupled to a circuit oscillator.

Dateiabrufe seit 01.10.2014 (Informationen über die Zugriffsstatistik)

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