Charge and flux insensitive tunable superconducting qubit

Abstract

Superconducting qubits with in-situ tunable properties are important for constructing a quantum computer. Qubit tunability, however, often comes at the expense of increased noise sensitivity. Here, we propose a flux-tunable superconducting qubit that minimizes the dephasing due to magnetic flux noise by engineering controllable flux "sweet spots" at frequencies of interest. This is realized by using a SQUID with asymmetric Josephson junctions shunted by a superinductor formed from an array of junctions. Taking into account correlated global and local noises, it is possible to improve dephasing time by several orders of magnitude. The proposed qubit can be used to realize fast, high-fidelity two-qubit gates in large-scale quantum processors, a key ingredient for implementing fault-tolerant quantum computers.

8 pages and 4 figures

References in corpus (9)

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• Model for l/f Flux Noise in SQUIDs and Qubits
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• Microscopic origin of low frequency flux noise in Josephson circuits
• Observation of classical-quantum crossover of 1/f flux noise and its paramagnetic temperature dependence
• Correlated flux noise and decoherence in two inductively coupled flux qubits
• UCSB final report for the CSQ program: Review of decoherence and materials physics for superconducting qubits

Cited by in corpus (7)

• Granular aluminum: A superconducting material for high impedance quantum circuits
• Quantum electrodynamics in a topological waveguide
• Circuit quantization in the presence of time-dependent external flux
• Engineering Dynamical Sweet Spots to Protect Qubits from 1/$f$ Noise
• AC flux sweet spots in parametrically-modulated superconducting qubits
• Revealing the system-bath coupling via Landau-Zener-Stückelberg interferometry in superconducting qubits
• Detector of microwave photon pairs based on a Josephson photomultiplier