Frequency-tunable high-<i>Q</i> superconducting resonators via wireless control of nonlinear kinetic inductance

Xu, Mingrui; Han, Xu; Fu, Wei; Zou, Chang‐Ling; Tang, Hong X.

doi:10.1063/1.5098466

Cited by 52 publications

(38 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The micro-disk simultaneously supports a high-quality (Q) factor optical whispering gallery mode and a high-frequency mechanical thickness mode at 10 GHz 36 . To maximize the electromechanical mode overlap and coupling, we implement our frequency-tunable "Ouroboros" design of the superconducting resonator 50 . The "Ouroboros" (yellow) forms a planar LC resonator which concentrates the electric field around its capacitor pads.…”

Section: Resultsmentioning

confidence: 99%

Cavity piezo-mechanics for superconducting-nanophotonic quantum interface

et al. 2020

Self Cite

View full text Add to dashboard Cite

Hybrid quantum systems are essential for the realization of distributed quantum networks. In particular, piezo-mechanics operating at typical superconducting qubit frequencies features low thermal excitations, and offers an appealing platform to bridge superconducting quantum processors and optical telecommunication channels. However, integrating superconducting and optomechanical elements at cryogenic temperatures with sufficiently strong interactions remains a tremendous challenge. Here, we report an integrated superconducting cavity piezo-optomechanical platform where 10 GHz phonons are resonantly coupled with photons in a superconducting cavity and a nanophotonic cavity at the same time. Taking advantage of the large piezo-mechanical cooperativity (C em~7) and the enhanced optomechanical coupling boosted by a pulsed optical pump, we demonstrate coherent interactions at cryogenic temperatures via the observation of efficient microwave-optical photon conversion. This hybrid interface makes a substantial step towards quantum communication at large scale, as well as novel explorations in microwave-optical photon entanglement and quantum sensing mediated by gigahertz phonons.

show abstract

Section: Resultsmentioning

confidence: 99%

Cavity piezo-mechanics for superconducting-nanophotonic quantum interface

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…maximizing an ESR echo amplitude for spins beneath the wire. Figure 2 shows the measured resonator frequency and loaded quality factor Q L as a function of the in-plane magnetic field B , while B ⊥ is kept at 0 T. As the static magnetic field increases from zero to B = 2.7 T, the resonance frequency decreases by 245 MHz and largely follows a parabolic dispersion (solid curve), as expected from the kinetic inductance resulting from the change in the Cooper pair density n s 29,30,34 . The parabolic dispersion only holds for superconductors where vortex losses are not dominant, and a divergence from this behavior indicates that the superconductor is predominately in its type-II state where flux vortices are the main source of loss 41 .…”

mentioning

confidence: 98%

Tuning high-Q superconducting resonators by magnetic field reorientation

et al. 2019

View full text Add to dashboard Cite

Superconducting resonators interfaced with paramagnetic spin ensembles are used to increase the sensitivity of electron spin resonance experiments and are key elements of microwave quantum memories. Certain spin systems that are promising for such quantum memories possess 'sweet spots' at particular combinations of magnetic fields and frequencies, where spin coherence times or linewidths become particularly favorable. In order to be able to couple high-Q superconducting resonators to such specific spin transitions, it is necessary to be able to tune the resonator frequency under a constant magnetic field amplitude. Here, we demonstrate a high quality, magnetic field resilient superconducting resonator, using a 3D vector magnet to continuously tune its resonance frequency by adjusting the orientation of the magnetic field. The resonator maintains a quality factor of > 10 5 up to magnetic fields of 2.6 T, applied predominantly in the plane of the superconductor. We achieve a continuous tuning of up to 30 MHz by rotating the magnetic field vector, introducing a component of 5 mT perpendicular to the superconductor.

show abstract

“…Therefore, such a setup was experimentally implemented. The superconducting resonator of interest possesses a resonant frequency of ω 0 = 2π × 10.53 GHz, which can be precisely tuned by a DC external magnetic field through a persistent current-induced-modification of kinetic inductance [37]. Characterized by a VNA with a weak coherent tone which excites about 3 photons in the resonator, the intrinsic and external coupling rates are found to be κ i = 2π × (113 ± 1) kHz and κ e = 2π × (298 ± 2) kHz, respectively.…”

mentioning

confidence: 99%

Radiative Cooling of a Superconducting Resonator

Han

Zou

et al. 2020

Phys. Rev. Lett.

Self Cite

View full text Add to dashboard Cite

Cooling microwave resonators to near the quantum ground state, crucial for their operation in the quantum regime, is typically achieved by direct device refrigeration to a few tens of millikelvin. However, in quantum experiments that require high operation power such as microwave-to-optics quantum transduction, it is desirable to operate at higher temperatures with non-negligible environmental thermal excitations, where larger cooling power is available. In this Letter, we present a radiative cooling protocol to prepare a superconducting microwave mode near its quantum ground state in spite of warm environment temperatures for the resonator. In this proof-of-concept experiment, the mode occupancy of a 10-GHz superconducting resonator thermally anchored at 1.02 K is reduced to 0.44 ± 0.05 by radiatively coupling to a 70-mK cold load. This radiative cooling scheme allows high-operation-power microwave experiments to work in the quantum regime, and opens possibilities for routing microwave quantum states to elevated temperatures.

show abstract

Frequency-tunable high-Q superconducting resonators via wireless control of nonlinear kinetic inductance

Cited by 52 publications

References 26 publications

Cavity piezo-mechanics for superconducting-nanophotonic quantum interface

Cavity piezo-mechanics for superconducting-nanophotonic quantum interface

Tuning high-Q superconducting resonators by magnetic field reorientation

Radiative Cooling of a Superconducting Resonator

Contact Info

Product

Resources

About