Solid State Quantum Information

Prospects of the inductively shunted Cooper pair box

speaker: Jens Koch (Departements of Physics and Applied Physics, Yale University)

abstract: Progress towards reliable quantum information processing in solid-state systems crucially depends on sufficient coherence of qubits. To date, typical error probabilities per gate are still above the fault-tolerant threshold. As verified in recent benchmarking experiments on superconducting transmon qubits, it is mainly relaxation and dephasing effects as well as the finite anharmonicity of the transmon which limits its performance. In pursuit of quantum circuits with low sensitivity to 1f noises but large anharmonicity, we study an inductively shunted Cooper pair box (CPBL). Our theoretical analysis shows that such a system is well-protected from charge noise, while maintaining large anharmonicity. Apart from these properties, which render the system a promising qubit candidate, we show that the existence of persistent-current states in the CPBL may also pave the way for the observation of Bloch oscillations.

timetable:
Fri 5 Dec, 11:30 - 12:00, Sala Stemmi
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