Nondestructive readout for a superconducting flux qubit

Details Nondestructive readout for a superconducting flux qubit Nondestructive readout for a superconducting flux qubit

2003-11-21

arxiv.org/abs/cond-mat/0311510v2

Phys. Rev. Lett. 93, 177006 (2004)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures; modified content, figures and references; accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.93.177006

We present a new readout method for a superconducting flux qubit, based on the measurement of the Josephson inductance of a superconducting quantum interference device that is inductively coupled to the qubit. The intrinsic flux detection efficiency and back-action are suitable for a fast and nondestructive determination of the quantum state of the qubit, as needed for readout of multiple qubits in a quantum computer. We performed spectroscopy of a flux qubit and we measured relaxation times of the order of 80 $\mu s$.

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