State tomography of capacitively shunted phase qubits with high fidelity

Details State tomography of capacitively shunted phase qubits with high fidelity State tomography of capacitively shunted phase qubits with high fidelity

2006-02-17

arxiv.org/abs/cond-mat/0602432v1

Physics

Condensed Matter

Superconductivity

submitted to PRL

Scientific paper

10.1103/PhysRevLett.97.050502

We introduce a new design concept for superconducting quantum bits (qubits) in which we explicitly separate the capacitive element from the Josephson tunnel junction for improved qubit performance. The number of two-level systems (TLS) that couple to the qubit is thereby reduced by an order of magnitude and the measurement fidelity improves to 90%. This improved design enables the first demonstration of quantum state tomography with superconducting qubits using single shot measurements.

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