Fano-enhanced low-loss on-chip superconducting microwave circulator

• URL: http://arxiv.org/abs/2406.14821v1
• Date: Fri, 21 Jun 2024 01:45:39 GMT
• Title: Fano-enhanced low-loss on-chip superconducting microwave circulator
• Authors: N. Pradeep Kumar, Dat Thanh Le, Prasanna Pakkiam, Thomas M. Stace, Arkady Fedorov,
• Abstract summary: We introduce large direct capacitive couplings between the waveguides to create strong Fano scattering interference. We measure enhanced circulation fidelity' above $97%$, with optimised on-resonance insertion loss of $0.2$dB, isolation of $18$dB, and power reflectance of $-15$dB.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Ferrite-free circulators that are passive and readily integratable on a chip are highly sought-after in quantum technologies based on superconducting circuits. In our previous work, we implemented such a circulator using a three-Josephson-junction loop that exhibited unambiguous nonreciprocity and signal circulation, but required junction energies to be within $1\%$ of design values. This tolerance is tighter than standard junction fabrication methods provide, so we propose and demonstrate a design improvement that relaxes the required junction fabrication precision, allowing for higher device performance and fabrication yield. Specifically, we introduce large direct capacitive couplings between the waveguides to create strong Fano scattering interference. We measure enhanced `circulation fidelity' above $97\%$, with optimised on-resonance insertion loss of $0.2$~dB, isolation of $18$~dB, and power reflectance of $-15$~dB, in good agreement with model calculations.

Related papers

• Many-excitation removal of a transmon qubit using a single-junction quantum-circuit refrigerator and a two-tone microwave drive [1.075363883202421]
  We experimentally demonstrate the utilization of a single-junction quantum-circuit refrigerator (QCR) for the reset of superconducting quantum devices. We observe excitation stabilization times down to roughly $500$ ns, a $20$-fold speedup with QCR and a simultaneous two-tone drive. Results pave the way for optimized reset of quantum-electric devices using engineered environments and for dissipation-engineered state preparation.
  arXiv  Detail & Related papers  (2024-01-26T14:46:22Z)
• Passive microwave circulation on a superconducting chip [0.0]
  We report the realisation of a passive on-chip circulator which is made from a loop consisting of three tunnel-coupled superconducting islands, with DC-only control fields. When tuned for circulation, the device exhibits strongly non-reciprocal 3-port scattering, with average on-resonance insertion loss of 2 dB, isolation of 14 dB, power reflectance of -11 dB, and a bandwidth of 200 MHz.
  arXiv  Detail & Related papers  (2023-08-28T15:16:29Z)
• Superconducting Non-Reciprocity Based on Time-Modulated Coupled-Resonator Systems [0.44641025448898464]
  We present a unified approach for designing superconducting non-reciprocal components, including circulators, isolators, and uni-directional amplifiers. Our method leverages standard SQUID-based resonators as building blocks to realize a wide range of on-chip non-reciprocal devices.
  arXiv  Detail & Related papers  (2023-07-04T18:00:00Z)
• Improved Coherence in Optically-Defined Niobium Trilayer Junction Qubits [45.786749852292246]
  Niobium offers the benefit of increased operating temperatures and frequencies for superconducting devices. We revisit niobium trilayer junctions and fabricate all-niobium transmons using only optical lithography. We characterize devices in the microwave domain, measuring coherence times up to $62mu$s and an average qubit quality factor above $105$.
  arXiv  Detail & Related papers  (2023-06-09T13:26:13Z)
• Erasure qubits: Overcoming the $T_1$ limit in superconducting circuits [105.54048699217668]
  amplitude damping time, $T_phi$, has long stood as the major factor limiting quantum fidelity in superconducting circuits. We propose a scheme for overcoming the conventional $T_phi$ limit on fidelity by designing qubits in a way that amplitude damping errors can be detected and converted into erasure errors.
  arXiv  Detail & Related papers  (2022-08-10T17:39:21Z)
• Enhancing the Coherence of Superconducting Quantum Bits with Electric Fields [62.997667081978825]
  We show that qubit coherence can be improved by tuning defects away from the qubit resonance using an applied DC-electric field. We also discuss how local gate electrodes can be implemented in superconducting quantum processors to enable simultaneous in-situ coherence optimization of individual qubits.
  arXiv  Detail & Related papers  (2022-08-02T16:18:30Z)
• Directional Josephson traveling-wave parametric amplifier via non-Hermitian topology [58.720142291102135]
  Low-noise microwave amplification is crucial for detecting weak signals in quantum technologies and radio astronomy. Current amplifiers do not satisfy all these requirements, severely limiting the scalability of superconducting quantum devices. Here, we demonstrate the feasibility of building a near-ideal quantum amplifier using a homogeneous Josephson junction array and the non-trivial topology of its dynamics.
  arXiv  Detail & Related papers  (2022-07-27T18:07:20Z)
• Aluminum air bridges for superconducting quantum devices realized using a single step electron-beam lithography process [0.0]
  In superconducting quantum devices, air bridges enable increased circuit complexity and density. We implement aluminum air bridges using a simple process based on single-step electron-beam gradient exposure. The resulting bridges have sizes ranging from $20mu m$ to $100mu m$, with a yield exceeding $99%$ for lengths up to $36mu m$.
  arXiv  Detail & Related papers  (2022-06-19T21:33:28Z)
• High fidelity two-qubit gates on fluxoniums using a tunable coupler [47.187609203210705]
  Superconducting fluxonium qubits provide a promising alternative to transmons on the path toward large-scale quantum computing. A major challenge for multi-qubit fluxonium devices is the experimental demonstration of a scalable crosstalk-free multi-qubit architecture. Here, we present a two-qubit fluxonium-based quantum processor with a tunable coupler element.
  arXiv  Detail & Related papers  (2022-03-30T13:44:52Z)
• Tunable coupling scheme for implementing two-qubit gates on fluxonium qubits [0.0]
  The superconducting fluxonium circuit is an RF-SQUID-type flux qubit that uses a large inductance built from an array of Josephson junctions or a high kinetic inductance material. In contrast to the transmon qubit, the anharmonicity of fluxonium can be large and positive, allowing for better separation between the low energy qubit manifold of the circuit and higher-lying excited states. We propose a tunable coupling scheme for implementing two-qubit gates on fixed-frequency fluxonium qubits, biased at half flux quantum.
  arXiv  Detail & Related papers  (2021-07-24T07:21:01Z)
• Coherent superconducting qubits from a subtractive junction fabrication process [48.7576911714538]
  Josephson tunnel junctions are the centerpiece of almost any superconducting electronic circuit, including qubits. In recent years, sub-micron scale overlap junctions have started to attract attention. This work paves the way towards a more standardized process flow with advanced materials and growth processes, and constitutes an important step for large scale fabrication of superconducting quantum circuits.
  arXiv  Detail & Related papers  (2020-06-30T14:52:14Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.