Figure 3 (a) Microwave spectroscopy spectrum showing the magnetic field dependence of the transition frequency from the ground state to the excited state of the π-junction flux qubit. (b) Coherence time showing an energy relaxation time T1 = 1.45 μs. (IMAGE)

National Institute of Information and Communications Technology (NICT)

Figure 3 (a) Microwave spectroscopy spectrum showing the magnetic field dependence of the transition frequency from the ground state to the excited state of the π-junction flux qubit. (b) Coherence time showing an energy relaxation time T1 = 1.45 μs.

Caption

Figure 3 (a) Microwave spectroscopy spectrum showing the magnetic field dependence of the transition frequency from the ground state to the excited state of the π-junction flux qubit. The arrow indicates the optimum operating point of the π-junction flux qubit, showing the lowest transition frequency. While the optimum operating point for conventional flux qubits appears at 0.5Φ0, the new flux qubit is characterized by its appearance at zero magnetic field (0Φ0).
(b) Coherence time measurement showing an energy relaxation time T1 = 1.45 μs.

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National Institute of Information and Communications Technology (NICT), NTT Corporation (NTT), Tohoku University and the Tokai National Higher Education and Research System Nagoya University

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