Magnetic field resilient superconducting fractal resonators for coupling to free spins

Graaf, S. E. de; Danilov, Andrey; Adamyan, A.; Bauch, Thilo; Kubatkin, Sergey

doi:10.1063/1.4769208

Cited by 52 publications

(57 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…33 Finally, we note that by applying a fractal-type perforation to the ground plane, the resonators can be made resilient to magnetic fields up to 400 mT. 4 We foresee that, by shrinking the ground plane down to a strip with the same width as the microstrip itself, operation in fields as high as 6 T should be feasible. 41 To conclude, the microstrip resonators present a valuable design alternative to coplanar resonators; in particular, when the fast frequency tuning is a primary design goal, the achievable parameters are on par or superior to CPW-based designs.…”

mentioning

confidence: 98%

“…The presented design can be incorporated into essentially any superconducting circuitry operating at temperatures below 2. Planar superconducting resonators are an enabling technology for quantum information processing, 1 hybrid quantum memory systems, 2,3 electron spin resonance (ESR) spectroscopy on femto mole samples, 4 kinetic inductance detectors, 5 and parametric amplifiers, 6 among many other applications. The resonators are instrumental for the whole field of circuit quantum electrodynamics (c-QED) for having dramatically reduced microwave mode volume, as compared to bulk cavities, and accordingly increased coupling to engineered q-bits and spins.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Tunable superconducting microstrip resonators

Adamyan

Kubatkin

Danilov

2016

Applied Physics Letters

Self Cite

View full text Add to dashboard Cite

We report on a simple yet versatile design for a tunable superconducting microstrip resonator. Niobium nitride is employed as the superconducting material and aluminum oxide, produced by atomic layer deposition, as the dielectric layer. We show that the high quality of the dielectric material allows to reach the internal quality factors in the order of Q i $ 10 4 in the single photon regime. Q i rapidly increases with the number of photons in the resonator N and exceeds 10 5 for N $ 10 À 50. A straightforward modification of the basic microstrip design allows to pass a current bias through the strip and to control its kinetic inductance. We achieve a frequency tuning df ¼ 62 MHz around f 0 ¼ 2:4 GHz for a fundamental mode and df ¼ 164 MHz for a third harmonic. This translates into a tuning parameter Q i df =f 0 ¼ 150. The presented design can be incorporated into essentially any superconducting circuitry operating at temperatures below 2.5 K.

show abstract

mentioning

confidence: 98%

mentioning

confidence: 99%

Tunable superconducting microstrip resonators

Adamyan

Kubatkin

Danilov

2016

Applied Physics Letters

Self Cite

View full text Add to dashboard Cite

show abstract

“…[22] Here, the spin state shifts the cavity resonance by ∆f = g [72,73] g c κ = 6.7 (33) Rabi cycles can be obtained for z 0 = 4.6 nm (6.9 nm), where κ = f /Q is the cavity loss rate.…”

mentioning

confidence: 99%

Charge-Insensitive Single-Atom Spin-Orbit Qubit in Silicon

et al. 2016

View full text Add to dashboard Cite

High fidelity entanglement of an on-chip array of spin qubits poses many challenges. Spin-orbit coupling (SOC) can ease some of these challenges by enabling long-ranged entanglement via electric dipole-dipole interactions, microwave photons, or phonons. However, SOC exposes conventional spin qubits to decoherence from electrical noise. Here, we propose an acceptor-based spin-orbit qubit in silicon offering long-range entanglement at a sweet spot where the qubit is protected from electrical noise. The qubit relies on quadrupolar SOC with the interface and gate potentials. As required for surface codes, 10^{5} electrically mediated single-qubit and 10^{4} dipole-dipole mediated two-qubit gates are possible in the predicted spin lifetime. Moreover, circuit quantum electrodynamics with single spins is feasible, including dispersive readout, cavity-mediated entanglement, and spin-photon entanglement. An industrially relevant silicon-based platform is employed.

show abstract

“…We excite and read out the state of the box using the same cavity, which is inductively coupled to a transmission line in order to further reduce coupling to parasitic modes and effectively filter out the electromagnetic environment from the qubit [22,23]. The cavity is also designed to be free of Abrikosov vortices and trapped flux in both the resonator and the nearby ground, hence its rather unconventional layout (it is still conceptually equivalent to a λ/4 resonator) [24].…”

mentioning

confidence: 99%

Charge Qubit Coupled to an Intense Microwave Electromagnetic Field in a Superconducting Nb Device: Evidence for Photon-Assisted Quasiparticle Tunneling

et al. 2013

Self Cite

View full text Add to dashboard Cite

We study a superconducting charge qubit coupled to an intensive electromagnetic field and probe changes in the resonance frequency of the formed dressed states. At large driving strengths, exceeding the qubit energy-level splitting, this reveals the well known Landau-Zener-Stückelberg (LZS) interference structure of a longitudinally driven two-level system. For even stronger drives we observe a significant change in the LZS pattern and contrast. We attribute this to photon-assisted quasiparticle tunneling in the qubit. This results in the recovery of the qubit parity, eliminating effects of quasiparticle poisoning and leads to an enhanced interferometric response. The interference pattern becomes robust to quasiparticle poisoning and has a good potential for accurate charge sensing. In a two-level system (TLS) under strong periodic nonadiabatic driving, the relative phase accumulated between successive tunneling events can play a significant role. The constructive or destructive interference between consecutive tunneling events are generally referred to as Landau-Zener-Stückelberg (LZS) oscillations. LZS oscillations are a celebrated phenomenon observed in a variety of quantum systems, ranging from optical lattices [1], nanomechanical circuits [2], single spins in diamond NV-centers [3], and semiconductor quantum dots [4,5], to Josephson qubits [6][7][8][9][10][11][12].In the regime of strong driving the steady state of a TLS coupled to a cavity is conveniently described in terms of photon dressed states, capturing the hybridization of the intense electromagnetic field and the TLS [12]. Such dressed states have successfully been applied in several applications, including lasing and amplification [13,14], suppression of decoherence in two-level systems [15], and single photon emission [16]. It is especially attractive to study dressed states in superconducting microcircuits, not only due to realizations of previously hardly accessible regimes [8,12], but also since they offer straightforward integration with other systems.In this article we present experimental observations of the interplay between photon dressed states of a superconducting charge qubit (Cooper-pair box, CPB) and quasiparticle creation. Remarkably, we find that when the CPB is driven into a regime where quasiparticle generation provides a dominant path for excitation/relaxation, the CPB exhibits a more pronounced interferometric response, while typically quasiparticle "poisoning" is degrading the performance of superconducting devices [17][18][19][20]. This effect emerges for strong driving * degraaf@chalmers.se of the qubit, when the two-level approximation of the CPB breaks down, and it is observed as a significant distortion of the typical LZS interference pattern. We attribute the increased response to the recovery of the qubit parity emerging in the ultra-strong driving regime. The populations of dressed states changes due to new quasiparticle-induced transition channels. At sufficient drive strengths the observed non-linear process involves...

show abstract

Magnetic field resilient superconducting fractal resonators for coupling to free spins

Cited by 52 publications

References 25 publications

Tunable superconducting microstrip resonators

Tunable superconducting microstrip resonators

Charge-Insensitive Single-Atom Spin-Orbit Qubit in Silicon

Charge Qubit Coupled to an Intense Microwave Electromagnetic Field in a Superconducting Nb Device: Evidence for Photon-Assisted Quasiparticle Tunneling

Contact Info

Product

Resources

About