aiqbench takeQuantum Computing

This theoretical work identifies quasiparticle absorption as a fundamental limit on microwave qubit fidelity in superconducting systems, challenging assumptions that gap engineering alone ensures coherence under strong drives. Crucially, it reveals a feedback loop where drive photons can generate new quasiparticles during operations, potentially negating error mitigation strategies and introducing decoherence even at cryogenic temperatures.

Source coveringQuantum Zeitgeist

What this isA model's reading of the article and related coverage, written for aiqbench. Not the publisher's words.

Quasiparticle Absorption Limits Microwave Qubit Fidelity

Quantum ZeitgeistJuly 30, 20265 min read

Driven superconducting qubits face fidelity limits due to quasiparticle absorption, a new theory details—existing or newly created quasiparticles can absorb qubit excitation & photons.

A single quasiparticle tunneling across a superconducting qubit's Josephson junction can simultaneously absorb a qubit excitation and photons from the microwave drive, according to a new theory developed by Mykola Kishmar of Columbia University, Pavel D. Kurilovich and Thomas Connolly of Yale University, and Andrey Klots, Igor L. Aleiner, and Vladislav D. Kurilovich of Google Quantum AI. Even at cryogenic temperatures, which are two orders of magnitude smaller than the superconducting energy gap, an appreciable fraction of Cooper pairs remain broken, contributing to these quasiparticle excitations. The work establishes a fundamental limitation on the fidelity of microwave qubit…

Excerpt shown under the publisher's RSS terms · 98 words · full text and figures are on the publisher's site

Read at Quantum Zeitgeist ↗Ask about this article