arXiv:1808.01034 · Physical Review Applied

Tunable Superconducting Two-Chip Lumped-Element Resonator

B. Ferdinand, Daniel Bothner, R. Kleiner, D. Koelle

Published Mar 20, 2019• 3 citations

Abstract

Superconducting coplanar microwave resonators may serve as a quantum bus to transfer information from superconducting qubits to natural spin systems, such as ultracold atomic vapors, for long-lived quantum memory. The authors investigate a stacked two-chip superconducting device, consisting of a lumped-element resonator side-coupled to a coplanar-waveguide transmission line. By moving the chips relative to each other, the device can be operated in different regimes, enabling control over both the resonance frequency and the coupling. This system has the advantage of providing tunable coupling to clouds of ultracold atoms that must be operated at millitesla-level magnetic fields.

DOI: 10.1103/physrevapplied.11.034050

Related papers

Coplanar waveguide resonators for circuit quantum electrodynamics

M. Göppl, A. Fragner, Matthias Baur +7 more

High quality on-chip microwave resonators have recently found prominent new applications in quantum optics and quantum information processing experiments with superconducting electronic circuits, a field now known as circuit quantum electrodynamics (QED). They are also used as single photon detectors and parametric amplifiers. Here we analyze the physical properties of coplanar waveguide resonators and their relation to the materials properties for use in circuit QED. We have designed and fabricated resonators with fundamental frequencies from 2 to 9 GHz and quality factors ranging from a few hundreds to a several hundred thousands controlled by appropriately designed input and output coupling capacitors. The microwave transmission spectra measured at temperatures of 20 mK are shown to be in good agreement with theoretical lumped element and distributed element transmission matrix models. In particular, the experimentally determined resonance frequencies, quality factors, and insertion losses are fully and consistently explained by the two models for all measured devices. The high level of control and flexibility in design renders these resonators ideal for storing and manipulating quantum electromagnetic fields in integrated superconducting electronic circuits.

arXiv:0807.4094Journal of Applied PhysicsDec 1, 2008370 citations

Tunable superconducting resonators via on-chip control of local magnetic field

Chen-Guang 晨光 Wang 王, Wen-Cheng 文诚 Yue 岳, Xuecou Tu +13 more

Superconducting microwave resonators play a pivotal role in superconducting quantum circuits. The ability to fine-tune their resonant frequencies provides enhanced control and flexibility. Here, we introduce a frequency-tunable superconducting coplanar waveguide resonator. By applying electrical currents through specifically designed ground wires, we achieve the generation and control of a localized magnetic field on the central line of the resonator, enabling continuous tuning of its resonant frequency. We demonstrate a frequency tuning range of 54.85 MHz in a 6.21-GHz resonator. This integrated and tunable resonator holds great potential as a dynamically tunable filter and as a key component of communication buses and memory elements in superconducting quantum computing.

arXiv:2405.09170Chinese Physics BMar 1, 20242 citations

Quantum state characterization of a fast tunable superconducting resonator

Z. L. Wang, Youpeng Zhong, L. J. He +4 more

We demonstrate a frequency-tunable superconducting coplanar waveguide resonator, with a tuning range of half a gigahertz and a switching time of 1 ns. The resonator is made tunable by inserting a superconducting quantum interference device in the center strip of the resonator. Quantum measurements are made by probing the resonator with a superconducting qubit, allowing us to use microwave photon Fock states to benchmark the resonator performance. Using the resonator, we shuttle energy quanta between the qubit and a microscopic two-level state. The tunable resonator can, therefore, serve as a communication bus or memory element in a prototype quantum processor.

Applied Physics LettersApr 22, 201374 citations

Coupling ultracold atoms to a superconducting coplanar waveguide resonator

H. Hattermann, Daniel Bothner, Li Yuan Ley +6 more

Abstract Ensembles of trapped atoms interacting with on-chip microwave resonators are considered as promising systems for the realization of quantum memories, novel quantum gates, and interfaces between the microwave and optical regime. Here, we demonstrate coupling of magnetically trapped ultracold Rb ground-state atoms to a coherently driven superconducting coplanar resonator on an integrated atom chip. When the cavity is driven off-resonance from the atomic transition, the microwave field strength in the cavity can be measured through observation of the AC shift of the atomic hyperfine transition frequency. When driving the cavity in resonance with the atoms, we observe Rabi oscillations between hyperfine states, demonstrating coherent control of the atomic states through the cavity field. These observations enable the preparation of coherent atomic superposition states, which are required for the implementation of an atomic quantum memory.

Jan 1, 201755 citations

Coupling ultracold atoms to a superconducting coplanar waveguide resonator

H. Hattermann, Daniel Bothner, L. Y. Ley +6 more

Ensembles of trapped atoms interacting with on-chip microwave resonators are considered as promising systems for the realization of quantum memories, novel quantum gates, and interfaces between the microwave and optical regime. Here, we demonstrate coupling of magnetically trapped ultracold Rb ground-state atoms to a coherently driven superconducting coplanar resonator on an integrated atom chip. When the cavity is driven off-resonance from the atomic transition, the microwave field strength in the cavity can be measured through observation of the AC shift of the atomic hyperfine transition frequency. When driving the cavity in resonance with the atoms, we observe Rabi oscillations between hyperfine states, demonstrating coherent control of the atomic states through the cavity field. These observations enable the preparation of coherent atomic superposition states, which are required for the implementation of an atomic quantum memory.

arXiv:1707.02730Nature CommunicationsDec 16, 201770 citations

Coupling of Rydberg atoms to a superconducting coplanar waveguide resonator for a quantum memory device

Li Yuan Ley

Ultracold atoms in their ground states are well-isolated quantum systems offering long coherence times. Hence, ensembles of trapped atoms coupling with on-chip microwave resonators are considered as promising systems for the realization of quantum memories. Here, we demonstrate the coupling of magnetically trapped ultracold 87Rb ground state atoms to a coherently driven superconducting coplanar waveguide resonator. When driving the cavity in resonance with the atomic transition, we observed Rabi oscillations between hyperfine states. This showed the capability in coherent controlling of the atomic states through the cavity field. When driving the cavity on-resonance with the atomic transition, the AC stark shift is observed. This showed the microwave field strength in the cavity seen by atoms. Strong interaction strength of Rydberg atoms in the microwave transition regime has been proposed as an interface during quantum memory writing. Here, we also describe the implementation of a Rydberg system into our experimental setup.

Oct 16, 20180 citations