Broadband Magnetless Isolator using Adiabatic Flux Modulation

• URL: http://arxiv.org/abs/2509.24551v1
• Date: Mon, 29 Sep 2025 10:01:28 GMT
• Title: Broadband Magnetless Isolator using Adiabatic Flux Modulation
• Authors: M. Demarets, A. M. Vadiraj, C. Caloz, K. De Greve,
• Abstract summary: Conventional ferrite-based isolators are bulky, lossy and rely on strong magnetic fields.<n>We present a magnetless isolator that overcomes these limitations with simulated performances on par with the state-of-the-art.<n>We propose a compact, low-loss, on-chip superconducting device that shows promise against parameter variations.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Isolators are commonly found in the amplification chain of microwave setups to shield sensitive devices such as superconducting qubits from noise and back-scattered signals. Conventional ferrite-based isolators are bulky, lossy and rely on strong magnetic fields, which pose challenges for their co-integration in large-scale superconducting devices. Here, we present a magnetless isolator that overcomes these limitations with simulated performances on par with the state-of-the-art. Using a dispersion-engineered transmission line with a propagating adiabatic flux modulation, the simulated device achieves more than 20 dB isolation over a broad frequency band ranging from 4 to 8 GHz, which can be modified based on the device parameters. Moreover, we propose a compact, low-loss, on-chip superconducting device that shows promise against parameter variations and enables a scalable path for co-integration with large-scale superconducting systems of the future.

Related papers

• Gate-tunable kinetic inductance parametric amplifier [0.0]
  We present a gate-tunable parametric amplifier that operates without Josephson junctions. This design achieves near-quantum-limited performance, featuring more than 20 dB gain and a 30 MHz gain-bandwidth product.
  arXiv  Detail & Related papers  (2023-08-14T07:54:19Z)
• Wideband Josephson Parametric Isolator [0.0]
  We present an alternative two-port isolating integrated circuit derived from the DC Superconducting Quantum Interference Device (DC-SQUID) Non-reciprocal transmission is achieved using the three-wave microwave mixing properties of a flux-modulated DC--SQUID.
  arXiv  Detail & Related papers  (2022-12-16T16:39:21Z)
• In-situ amplification of spin echoes within a kinetic inductance parametric amplifier [0.0]
  Superconducting micro-resonators in combination with quantum-limited Josephson parametric amplifiers lead to more than four orders of magnitude improvement in sensitivity of pulsed Electron Spin Resonance (ESR) measurements. We present a technique for coupling an ensemble of spins directly to a weakly nonlinear microwave resonator, which is engineered from a magnetic field-resilient thin superconducting film. We perform pulsed ESR measurements with a $1$pL effective mode volume and amplify the resulting spin signal using the same device, achieving a sensitivity of $2.8 times 103$ spins in a single-shot Hahn echo measurement at a temperature of 400
  arXiv  Detail & Related papers  (2022-11-21T10:36:41Z)
• An integrated microwave-to-optics interface for scalable quantum computing [47.187609203210705]
  We present a new design for an integrated transducer based on a superconducting resonator coupled to a silicon photonic cavity. We experimentally demonstrate its unique performance and potential for simultaneously realizing all of the above conditions. Our device couples directly to a 50-Ohm transmission line and can easily be scaled to a large number of transducers on a single chip.
  arXiv  Detail & Related papers  (2022-10-27T18:05:01Z)
• Nonreciprocal devices based on voltage-tunable junctions [48.7576911714538]
  We propose to couple the flux degree of freedom of one mode with the charge degree of freedom of a second mode in a hybrid superconducting-semiconducting architecture. Nonreciprocity can arise in this architecture in the presence of external static magnetic fields alone.
  arXiv  Detail & Related papers  (2022-09-13T17:49:19Z)
• Topological Josephson parametric amplifier array: A proposal for directional, broadband, and low-noise amplification [39.58317527488534]
  Low-noise microwave amplifiers are crucial for detecting weak signals in fields such as quantum technology and radio astronomy. We show that compact devices with few sites can achieve exceptional performance, with gains exceeding 20 dB over a bandwidth ranging from hundreds of MHz to GHz. The device also operates near the quantum noise limit and provides topological protection against up to 15% fabrication disorder.
  arXiv  Detail & Related papers  (2022-07-27T18:07:20Z)
• Ultra linear magnetic flux-to-voltage conversion in superconducting quantum interference proximity transistors [0.0]
  We propose an intrinsically-linear flux-to-voltage mesoscopic transducer, called bi-SQUIPT, based on the superconducting quantum interference proximity transistor. The bi-SQUIPT provides a voltage-noise spectral density as low as $sim10-16$ V/Hz$1/2$ and, more interestingly, under a proper operation parameter selection, exhibits a spur-free dynamic range as large as $sim60$ dB.
  arXiv  Detail & Related papers  (2022-07-01T11:12:49Z)
• A hybrid ferromagnetic transmon qubit: circuit design, feasibility and detection protocols for magnetic fluctuations [45.82374977939355]
  We show that the characteristic hysteretic behavior of the ferromagnetic barrier provides an alternative and intrinsically digital tuning of the qubit frequency by means of magnetic field pulses. The possibility to use the qubit as a noise detector and its relevance to investigate the subtle interplay of magnetism and superconductivity is envisaged.
  arXiv  Detail & Related papers  (2022-06-01T18:50:26Z)
• 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)
• Superconducting coupler with exponentially large on-off ratio [68.8204255655161]
  Tunable two-qubit couplers offer an avenue to mitigate errors in multiqubit superconducting quantum processors. Most couplers operate in a narrow frequency band and target specific couplings, such as the spurious $ZZ$ interaction. We introduce a superconducting coupler that alleviates these limitations by suppressing all two-qubit interactions with an exponentially large on-off ratio.
  arXiv  Detail & Related papers  (2021-07-21T03:03:13Z)
• Magnetic-free traveling-wave nonreciprocal superconducting microwave components [0.0]
  We propose a design to realize integrated broadband nonreciprocal microwave isolators and circulators using superconducting circuit elements without any magnetic materials. The bandwidth of 580 MHz can be realized over a nonreciprocal isolation of 20 dB in reflections.
  arXiv  Detail & Related papers  (2021-06-05T16:15:38Z)
• Waveguide Bandgap Engineering with an Array of Superconducting Qubits [101.18253437732933]
  We experimentally study a metamaterial made of eight superconducting transmon qubits with local frequency control. We observe the formation of super- and subradiant states, as well as the emergence of a polaritonic bandgap. The circuit of this work extends experiments with one and two qubits towards a full-blown quantum metamaterial.
  arXiv  Detail & Related papers  (2020-06-05T09:27:53Z)

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.