Abstract
Microwave resonators with high quality factors have enabled many recent breakthroughs with superconducting qubits and photon detectors, typically operated in shielded environments to reduce the ambient magnetic field. Insufficient shielding or pulsed control fields can introduce vortices, leading to reduced quality factors, although increased pinning can mitigate this effect. A narrow slot etched into the resonator surface provides a straightforward method for pinning enhancement without otherwise affecting the resonator. Resonators patterned with such a slot exhibited over an order of magnitude reduction in the excess loss due to vortices compared with identical resonators from the same film with no slot.
Highlights
Microwave resonators with high quality factors have enabled many recent breakthroughs with superconducting qubits and photon detectors, typically operated in shielded environments to reduce the ambient magnetic field
High-quality factor resonators have enabled the development of Microwave Kinetic Inductance Detectors (MKIDs), highly sensitive photon detectors for astrophysical measurements [4]
If the resonators are not cooled in a sufficiently small ambient magnetic field, or if large pulsed fields are present for operating circuits in the vicinity of the resonators, vortices can become trapped in the resonator traces, providing another loss channel
Summary
Microwave resonators with high quality factors have enabled many recent breakthroughs with superconducting qubits and photon detectors, typically operated in shielded environments to reduce the ambient magnetic field. P.; and Yu, Kang, "Reducing Microwave Loss in Superconducting Resonators due to Trapped Vortices" (2009). Reducing microwave loss in superconducting resonators due to trapped vortices
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