Anharmonicity of a Gatemon Qubit with a Few-Mode Josephson Junction

Abstract

Coherent operation of gate-voltage-controlled hybrid transmon qubits (gatemons) based on semiconductor nanowires was recently demonstrated. Here we experimentally investigate the anharmonicity in epitaxial InAs-Al Josephson junctions, a key parameter for their use as a qubit. Anharmonicity is found to be reduced by roughly a factor of two compared to conventional metallic junctions, and dependent on gate voltage. Experimental results are consistent with a theoretical model, indicating that Josephson coupling is mediated by a small number of highly transmitting modes in the semiconductor junction.

References in corpus (15)

• Charge insensitive qubit design derived from the Cooper pair box
• Suppressing Charge Noise Decoherence in Superconducting Charge Qubits
• Epitaxy of Semiconductor-Superconductor nanowires
• Tunable Supercurrent Through Semiconductor Nanowires
• Procedure for systematically tuning up crosstalk in the cross resonance gate
• Generating Single Microwave Photons in a Circuit
• A Semiconductor Nanowire-Based Superconducting Qubit
• Hard gap in epitaxial semiconductor-superconductor nanowires
• Realization of microwave quantum circuits using hybrid superconducting-semiconducting nanowire Josephson elements
• Coherent manipulation of Andreev states in superconducting atomic contacts
• Microwave spectroscopy of spinful Andreev bound states in ballistic semiconductor Josephson junctions
• Current-phase relations of few-mode InAs nanowire Josephson junctions
• Gatemon Benchmarking and Two-Qubit Operation
• Conduction Channels of an InAs-Al nanowire Josephson weak link
• Controlling charge quantization with quantum fluctuations

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