Quantum mechanics

Algorithm

Quantum computer

Coherence (philosophical gambling strategy)

Particle physics

Scalability

Computer science

Floquet theory

Statistical physics

Flux qubit

Imaging phantom

Physics

Nonlinear system

Database

Mathematics

Optics

Image (mathematics)

Artificial intelligence

Phase qubit

Quantum

Dephasing

Combinatorics

Qubit

Quantum information

Topology (electrical circuits)

Noise (video)

Physical Review Applied

Superconducting qubits provide a promising architecture for scalability in quantum information processing, but their coherence times are currently limited by environmental noise, miring such processors in the noisy intermediate-scale regime. Operating at ``sweet spots'' (turning points in a qubit's microwave spectrum) can substantially reduce the dephasing due to $1/f$ flux noise. The authors extend this concept to boost noise mitigation with an external drive, yielding $d\phantom{\rule{0}{0ex}}y\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}m\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}c\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}l$ sweet spots and turning static sweet ``spots'' into manifolds. This simple, powerful approach adds flexibility to the choice of operating points, and could enhance coherence times by more than an order of magnitude.

Engineering Dynamical Sweet Spots to Protect Qubits from <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mi>f</mml:mi></mml:math> Noise

Engineering Dynamical Sweet Spots to Protect Qubits from 1/f Noise