Nondestructive readout for a superconducting flux qubit
A. Lupascu, C. J. M. Verwijs, R. N. Schouten, C. J. P. M. Harmans, J. E. Mooij
Abstract
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 μs.
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