Superconducting Qubits Above 20 GHz Operating over 200 mK
- URL: http://arxiv.org/abs/2402.03031v1
- Date: Mon, 5 Feb 2024 14:15:22 GMT
- Title: Superconducting Qubits Above 20 GHz Operating over 200 mK
- Authors: Alexander Anferov, Shannon P. Harvey, Fanghui Wan, Jonathan Simon, and
David I. Schuster
- Abstract summary: Current superconducting microwave qubits are cooled to extremely low temperatures to avoid sources of decoherence.
To operate superconducting qubits at higher temperatures, it is necessary to address both quasiparticle decoherence and dephasing from thermal microwave photons.
We fabricate transmons with higher frequencies than previously studied, up to 24 GHz.
- Score: 39.76747788992184
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Current state-of-the-art superconducting microwave qubits are cooled to
extremely low temperatures to avoid sources of decoherence. Higher qubit
operating temperatures would significantly increase the cooling power
available, which is desirable for scaling up the number of qubits in quantum
computing architectures and integrating qubits in experiments requiring
increased heat dissipation. To operate superconducting qubits at higher
temperatures, it is necessary to address both quasiparticle decoherence (which
becomes significant for aluminum junctions above 160 mK) and dephasing from
thermal microwave photons (which are problematic above 50 mK). Using low-loss
niobium trilayer junctions, which have reduced sensitivity to quasiparticles
due to niobium's higher superconducting transition temperature, we fabricate
transmons with higher frequencies than previously studied, up to 24 GHz. We
measure decoherence and dephasing times of about 1 us, corresponding to average
qubit quality factors of approximately $10^5$, and find that decoherence is
unaffected by quasiparticles up to 1 K. Without relaxation from quasiparticles,
we are able to explore dephasing from purely thermal sources, finding that our
qubits can operate up to approximately 250 mK while maintaining similar
performance. The thermal resilience of these qubits creates new options for
scaling up quantum processors, enables hybrid quantum experiments with high
heat dissipation budgets, and introduces a material platform for even
higher-frequency qubits.
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