3D Integrated Embedded Filters for Superconducting Quantum Circuits

• URL: http://arxiv.org/abs/2602.24003v1
• Date: Fri, 27 Feb 2026 13:27:05 GMT
• Title: 3D Integrated Embedded Filters for Superconducting Quantum Circuits
• Authors: Waqas Ahmad, Gioele Consani, Mohammad Tasnimul Haque, Jacob Dunstan, Brian Vlastakis,
• Abstract summary: This work presents the design and implementation of novel microwave Purcell filters for superconducting quantum circuits.<n>The off-chip design removes all filter components from the qubit substrate, reducing device complexity, improving layout footprint.<n> Electromagnetic simulations of the filter predict a thousand-fold improvement in qubit isolation from the readout port.
• Score: 0.2745710357130238
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Microwave filtering for superconducting qubits is a key element of quantum computing technology, enabling high coherence and fast state detection. This work presents the design and implementation of novel microwave Purcell filters for superconducting quantum circuits, integrated within a multilayer printed circuit board (PCB). The off-chip design removes all filter components from the qubit substrate, reducing device complexity, improving layout footprint and allowing better scalability to large qubit counts. Each embedded filter can couple up to nine readout resonators, enabling efficient multiplexed readout. Electromagnetic simulations of the filter predict a thousand-fold improvement in qubit isolation from the readout port. The design was experimentally validated under cryogenic conditions in conjunction with a 35-qubit device, demonstrating compatibility of the PCB-based filter with high-coherence superconducting qubits. The comparison of the measured qubit median T1 of 84 $μ$s with the expected radiative limit from electromagnetic simulations validated the presence of Purcell filtering in the system.

Related papers

• Reflection-less filter for superconducting quantum circuits [0.0]
  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.
  arXiv  Detail & Related papers  (2025-06-25T17:41:34Z)
• Performance Characterization of a Multi-Module Quantum Processor with Static Inter-Chip Couplers [63.42120407991982]
  Three-dimensional integration technologies such as flip-chip bonding are a key prerequisite to realize large-scale superconducting quantum processors.<n>We present a design for a multi-chip module comprising one carrier chip and four qubit modules.<n>Measuring two of the qubits, we analyze the readout performance, finding a mean three-level state-assignment error of $9 times 10-3$ in 200 ns.<n>We demonstrate a controlled-Z two-qubit gate in 100 ns with an error of $7 times 10-3$ extracted from interleaved randomized benchmarking.
  arXiv  Detail & Related papers  (2025-03-16T18:32:44Z)
• Multiplexed Readout of Superconducting Qubits Using a 3D Re-entrant Cavity Filter [0.0]
  We present a 3D re-entrant cavity filter designed for frequency-multiplexed readout of superconducting qubits.<n>The cavity filter is situated out of the plane of the qubit circuit and capacitively couples to an array of on-chip readout resonators in a manner that can scale to large qubit arrays.
  arXiv  Detail & Related papers  (2024-12-19T13:48:17Z)
• Site-Controlled Purcell-Induced Bright Single Photon Emitters in Hexagonal Boron Nitride [62.170141783047974]
  Single photon emitters hosted in hexagonal boron nitride (hBN) are essential building blocks for quantum photonic technologies that operate at room temperature. We experimentally demonstrate large-area arrays of plasmonic nanoresonators for Purcell-induced site-controlled SPEs. Our results offer arrays of bright, heterogeneously integrated quantum light sources, paving the way for robust and scalable quantum information systems.
  arXiv  Detail & Related papers  (2024-05-03T23:02:30Z)
• Characterization of Broadband Purcell Filters with Compact Footprint for Fast Multiplexed Superconducting Qubit Readout [2.8106259549258152]
  We report a broad bandwidth Purcell filter design within a small footprint, which effectively suppresses Purcell loss without losing the fast measurement speed. The measured bandwidth is over 790 MHz within 0.29 mm$2$ while the estimated lifetime enhancement can be over 5000 times with multiple Purcell filters.
  arXiv  Detail & Related papers  (2023-10-20T05:09:52Z)
• Design and simulation of a transmon qubit chip for Axion detection [103.69390312201169]
  Device based on superconducting qubits has been successfully applied in detecting few-GHz single photons via Quantum Non-Demolition measurement (QND) In this study, we present Qub-IT's status towards the realization of its first superconducting qubit device.
  arXiv  Detail & Related papers  (2023-10-08T17:11:42Z)
• 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)
• 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)
• 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)
• High-efficiency microwave-optical quantum transduction based on a cavity electro-optic superconducting system with long coherence time [52.77024349608834]
  Frequency conversion between microwave and optical photons is a key enabling technology to create links between superconducting quantum processors. We propose a microwave-optical platform based on long-coherence-time superconducting radio-frequency (SRF) cavities. We show that the fidelity of heralded entanglement generation between two remote quantum systems is enhanced by the low microwave losses.
  arXiv  Detail & Related papers  (2022-06-30T17:57:37Z)
• Near-Field Terahertz Nanoscopy of Coplanar Microwave Resonators [61.035185179008224]
  Superconducting quantum circuits are one of the leading quantum computing platforms. To advance superconducting quantum computing to a point of practical importance, it is critical to identify and address material imperfections that lead to decoherence. Here, we use terahertz Scanning Near-field Optical Microscopy to probe the local dielectric properties and carrier concentrations of wet-etched aluminum resonators on silicon.
  arXiv  Detail & Related papers  (2021-06-24T11:06:34Z)

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.