Reflection-less filter for superconducting quantum circuits

• URL: http://arxiv.org/abs/2506.20645v1
• Date: Wed, 25 Jun 2025 17:41:34 GMT
• Title: Reflection-less filter for superconducting quantum circuits
• Authors: Jessica Kedziora, Eric Q. Bui, Alec Yen, Andres E. Lombo, Kaidong Peng, Terence J. Weir, Kevin P. O'Brien,
• Abstract summary: Superconducting version of special class of microwave filters known as reflection-less filters.<n>Can simultaneously permit low pass band loss to preserve quantum efficiency.<n>Also suppresses thermal photons emitted in its pass band from the termination resistors by the nature of the dual network topology.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Protecting superconducting quantum circuits from non-ideal return loss, including out-of-band circulator behavior and enhancing the performance of broadband quantum-limited amplifiers can be accomplished using a superconducting version of a special class of microwave filters known as reflection-less filters. These filters can simultaneously permit low pass band loss to preserve quantum efficiency and broad band reflection-less characteristics in the stop and pass bands. The filter also suppresses thermal photons emitted in its pass band from the termination resistors by the nature of the dual network topology. This work will review the application, theory, design, and modeling of a superconducting reflection-less filter, followed by fabrication details and the presentation of cryogenic performance measurements of a monolithic device. The filter was fabricated using Al on Si, incorporating NiCr resistors, which allows for simple integration with other superconducting quantum devices. The filter with an area of 0.6 $\mathrm{\mathbf{mm^2}}$ achieves insertion loss below 1 dB, including its connectorized package over a 80\% fractional bandwidth centered at 8 GHz, and 10 dB packaged return loss from DC to above 14.5 GHz.

Related papers

• Co-designed reflective and leaky-waveguide low-pass filter for superconducting circuits [0.0]
  The filter combines low insertion loss in the passband with strong attenuation at high frequencies.<n>It is well suited for superconducting quantum computing applications, where qubits are sensitive to both near-band and far out-of-band radiation.<n>Design offers a compact, low-loss solution for near-band filtering and suppression of quasi-particle-generating radiation in cryogenic quantum systems.
  arXiv  Detail & Related papers  (2025-08-04T14:41:23Z)
• Flexible Readout and Unconditional Reset for Superconducting Multi-Qubit Processors with Tunable Purcell Filters [13.38844783880794]
  We show a scalable architecture employing frequency-tunable nonlinear Purcell filters, enabling flexible readout and fast unconditional reset of superconducting qubits.<n>We achieve a readout fidelity of $99.3%$ without any quantum-limited amplifier, even with a small dispersive shift.<n>This architecture shows exceptional performance in qubit readout, reset, and protection, marking it as a promising hardware component for advancing fault-tolerant quantum computing systems.
  arXiv  Detail & Related papers  (2025-07-09T16:11:42Z)
• Sub-resonant wideband superconducting Purcell filters [0.17044823344691243]
  Purcell filters protect qubit information from decaying into external lines in superconducting quantum devices.<n>We introduce and demonstrate a novel Purcell filter design that places the readout resonator frequencies in a "linewidth plateau" below the filter's first resonant mode.<n>This approach can simultaneously achieve strong qubit protection and nearly constant external coupling across a wide readout bandwidth.
  arXiv  Detail & Related papers  (2025-03-13T18:00:00Z)
• Balanced cross-Kerr coupling for superconducting qubit readout [41.94295877935867]
  Dispersive readout, the standard method for measuring superconducting qubits, is limited by multiphoton qubit-resonator processes.<n>In this work, we propose a novel readout method, termed "junction readout"
  arXiv  Detail & Related papers  (2025-01-15T18:52:08Z)
• Efficient, ultra-high attenuation fiber Bragg grating filter for photon noise suppression [0.0]
  The filter consists of a fiber Bragg grating with multiple $pi$-phase discontinuities inscribed into a single mode photosensitive fiber.<n>The measured performance closely matches the simulated spectrum calculated from the design parameters.<n>These filters show great promise for applications reliant on high-frequency resolution noise suppression, such as quantum networking.
  arXiv  Detail & Related papers  (2024-12-01T22:09:25Z)
• Low-loss Millimeter-wave Resonators with an Improved Coupling Structure [39.76747788992184]
  Millimeter-wave superconducting resonators are a useful tool for studying quantum device coherence in a new frequency domain. We develop and characterize a tapered transition structure coupling a rectangular waveguide to a planar slotline waveguide with better than 0.5 dB efficiency over 14 GHz. Having decoupled the resonators from radiative losses, we consistently achieve single-photon quality factors above $105$, with a two-level-system loss limit above $106$.
  arXiv  Detail & Related papers  (2023-11-03T02:26:44Z)
• Robust cryogenic matched low-pass coaxial filters for quantum computing applications [0.0]
  Matched coaxial filters can prevent microwave and IR photons negative influence on superconducting quantum circuits. A robust transmission coefficient with designed linear absorption (-1dB/GHz) and ultralow reflection losses less than -20 dB up to 20 GHz is achieved.
  arXiv  Detail & Related papers  (2022-10-27T10:17:57Z)
• Suppressing Amplitude Damping in Trapped Ions: Discrete Weak Measurements for a Non-unitary Probabilistic Noise Filter [62.997667081978825]
  We introduce a low-overhead protocol to reverse this degradation. We present two trapped-ion schemes for the implementation of a non-unitary probabilistic filter against amplitude damping noise. This filter can be understood as a protocol for single-copy quasi-distillation.
  arXiv  Detail & Related papers  (2022-09-06T18:18:41Z)
• 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)
• Low-pass filter with ultra-wide stopband for quantum computing applications [0.0]
  A new type of low-pass filter based on a leaky coaxial waveguide is presented. The filter has minimal insertion loss in the pass band, while at the same time high attenuation in the stop band is achieved. It is suitable for superconducting quantum computing applications where qubits are sensitive to radiation with energy high enough to break Cooper-pairs.
  arXiv  Detail & Related papers  (2022-05-08T19:27:35Z)
• Unimon qubit [42.83899285555746]
  Superconducting qubits are one of the most promising candidates to implement quantum computers. Here, we introduce and demonstrate a superconducting-qubit type, the unimon, which combines the desired properties of high non-linearity, full insensitivity to dc charge noise, insensitivity to flux noise, and a simple structure consisting only of a single Josephson junction in a resonator.
  arXiv  Detail & Related papers  (2022-03-11T12:57:43Z)
• Broadband continuous variable entanglement generation using Kerr-free Josephson metamaterial [40.96261204117952]
  Entangled microwave photons form a fundamental resource for quantum information processing and sensing. We use a low-loss Josephson metamaterial to generate frequency-entangled photons from vacuum fluctuations at a rate of 2 giga entangled bits per second spanning over 4 GHz bandwidth.
  arXiv  Detail & Related papers  (2021-11-11T11:05:17Z)
• Engineering the microwave to infrared noise photon flux for superconducting quantum systems [4.620669069898039]
  cryogenic microwave low-pass filters with CR-110 and Esorb-230 absorptive dielectric fillings are presented. Noise photons of higher frequencies -- beyond the pair-breaking energies -- cause decoherence. The estimated dramatic suppression of the noise photon flux due to the filter proves its usefulness for experiments with superconducting quantum systems.
  arXiv  Detail & Related papers  (2021-07-20T08:43:20Z)
• Localization and reduction of superconducting quantum coherent circuit losses [42.18003724534518]
  Quantum sensing and computation can be realized with superconducting microwave circuits. Qubits are engineered quantum systems of capacitors and inductors with non-linear Josephson junctions.
  arXiv  Detail & Related papers  (2020-12-14T14:50:48Z)
• Understanding photoluminescence in semiconductor Bragg-reflection waveguides: Towards an integrated, GHz-rate telecom photon pair source [47.399953444625154]
  semiconductor integrated sources of photon pairs may operate at pump wavelengths much closer to the bandgap of the materials. We show that devices operating near the long wavelength end of the S-band or the short C-band require temporal filtering shorter than 1 ns. We predict that shifting the operating wavelengths to the L-band and making small adjustments in the material composition will reduce the amount of photoluminescence to negligible values.
  arXiv  Detail & Related papers  (2020-10-12T06:27:30Z)

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.