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Quantum Engineering Year 2: Advanced Quantum Science Month 33Day 899

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Year 2·Month 33·Week 1

Day 899: Flux Qubits and Fluxonium

Day 899 of 2,016~18 min read

Learning Objectives

•**Derive** the Hamiltonian of persistent current flux qubits
•**Explain** the double-well potential and tunneling between flux states
•**Identify** flux sweet spots and their protection against flux noise
•**Describe** the fluxonium qubit and the role of superinductors
•**Compare** flux-based qubits with transmon in terms of noise sensitivity
•**Calculate** qubit frequencies and matrix elements for flux qubits

Today's Schedule (7 hours)

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On this page

1 The Flux Qubit Concept 2 RF-SQUID Simplest Flux Qubit 3 Persistent Current PC Flux Qubit 4 Flux Sweet Spot 5 Flux Qubit Energy Levels 6 Fluxonium Superinductor-Shunted Qubit 7 Fluxonium Regimes 8 Fluxonium Sweet Spot 9 Matrix Elements and Transitions 10 Noise Sensitivity Comparison Quantum Computing Applications Flux Qubits in Quantum Annealing Fluxonium for Long Coherence Hybrid Approaches Protected Qubits

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