Measurement-induced entanglement of two superconducting qubits

Details Measurement-induced entanglement of two superconducting qubits Measurement-induced entanglement of two superconducting qubits

2008-06-19

arxiv.org/abs/0806.3148v1

J. Phys.: Conf. Ser. 150, 022051 (2009).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

10.1088/1742-6596/150/2/022051

We study the problem of two superconducting quantum qubits coupled via a resonator. If only one quanta is present in the system and the number of photons in the resonator is measured with a null result, the qubits end up in an entangled Bell state. Here we look at one source of errors in this quantum nondemolition scheme due to the presence of more than one quanta in the resonator, previous to the measurement. By analyzing the structure of the conditional Hamiltonian with arbitrary number of quanta, we show that the scheme is remarkably robust against these type of errors.

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