Orthogonal frequency-division multiplexing for simultaneous gate operations on multiple qubits via a shared control line

• URL: http://arxiv.org/abs/2511.16855v1
• Date: Thu, 20 Nov 2025 23:36:23 GMT
• Title: Orthogonal frequency-division multiplexing for simultaneous gate operations on multiple qubits via a shared control line
• Authors: Haruki Mitarai, Yukihiro Tadokoro, Hiroya Tanaka,
• Abstract summary: Scaling poses significant challenges in terms of the thermal loads, forming a major bottleneck in the realization of large-scale quantum computers.<n>We analyze simultaneous gate operations on multiple qubits using microwaves transmitted via a single cable in a frequency-division multiplexing scheme.<n>Our findings enable a scalable FDM-based microwave control scheme suitable for quantum processors with a large number of qubits.
• Score: 1.0068173369769948
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The increasing number of qubits in quantum processors necessitates a corresponding increase in the number of control lines between the processor, which is typically operated at cryogenic temperatures, and external electronics. Scaling poses significant challenges in terms of the thermal loads, forming a major bottleneck in the realization of large-scale quantum computers. In this study, we analyze simultaneous gate operations on multiple qubits using microwaves transmitted via a single cable in a frequency-division multiplexing (FDM) scheme. By employing rectangular control microwave pulses, we reveal the contribution of drive frequency spacing to gate fidelity. Through theoretical and numerical analyses, we demonstrate that orthogonal and quasi-orthogonal microwave signals suppress interference in simultaneously driven qubits, thereby ensuring high gate fidelity. Additionally, we provide design guidelines for key parameters, including pulse length, number of multiplexed microwave signals, and rotation angle, to achieve precise qubit operations. Our findings enable a scalable FDM-based microwave control scheme suitable for quantum processors with a large number of qubits.

Related papers

• Active interference suppression in frequency-division-multiplexed quantum gates via off-resonant microwave tones [1.0068173369769948]
  We propose an active interference suppression method for frequency-division-multiplexed simultaneous gate operations.<n>We find that by incorporating off-resonant microwave tones, the gate decreases proportionally to the inverse square of the number of microwave tones.<n>Our approach is simple yet effective for improving the performance of frequency-division-multiplexed quantum gates.
  arXiv  Detail & Related papers  (2026-01-21T00:06:53Z)
• 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)
• Dynamic Josephson Junction Metasurfaces for Multiplexed Control of Superconducting Qubits [0.0]
  We propose a space-time modulated Josephson Junction metasurface architecture to generate and multiplex microwave control signals directly at millikelvin (mK) temperatures.<n>Results demonstrate the generation of multiple frequency tones with controlled parameters, enabling efficient and scalable qubit control while minimizing thermal loads and wiring overhead.
  arXiv  Detail & Related papers  (2024-11-02T19:19:37Z)
• In situ Qubit Frequency Tuning Circuit for Scalable Superconducting Quantum Computing: Scheme and Experiment [23.955959205144353]
  We propose a scalable scheme to tune the qubit frequency by using in situ superconducting circuit.<n>Our work paves the way for large-scale control of superconducting quantum processor.
  arXiv  Detail & Related papers  (2024-07-31T08:02:20Z)
• Pulse-controlled qubit in semiconductor double quantum dots [57.916342809977785]
  We present a numerically-optimized multipulse framework for the quantum control of a single-electron charge qubit. A novel control scheme manipulates the qubit adiabatically, while also retaining high speed and ability to perform a general single-qubit rotation.
  arXiv  Detail & Related papers  (2023-03-08T19:00:02Z)
• Two qubits in one transmon -- QEC without ancilla hardware [68.8204255655161]
  We show that it is theoretically possible to use higher energy levels for storing and controlling two qubits within a superconducting transmon. The additional qubits could be used in algorithms which need many short-living qubits in error correction or by embedding effecitve higher connectivity in qubit networks.
  arXiv  Detail & Related papers  (2023-02-28T16:18:00Z)
• Coupler microwave-activated controlled phase gate on fluxonium qubits [32.73124984242397]
  A tunable coupler typically includes a nonlinear element, such as a SQUID, which is used to tune the resonance frequency of an LC circuit connecting two qubits. Here we propose a complimentary approach where instead of tuning the resonance frequency of the tunable coupler by applying a quasistatic control signal, we excite by microwave the degree of freedom associated with the coupler itself.
  arXiv  Detail & Related papers  (2023-02-20T07:51:04Z)
• Extensible circuit-QED architecture via amplitude- and frequency-variable microwaves [52.77024349608834]
  We introduce a circuit-QED architecture combining fixed-frequency qubits and microwave-driven couplers. Drive parameters appear as tunable knobs enabling selective two-qubit coupling and coherent-error suppression.
  arXiv  Detail & Related papers  (2022-04-17T22:49:56Z)
• 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)
• Full control of superconducting qubits with combined on-chip microwave and flux lines [0.0]
  We present a method to integrate a microwave line and a flux line into a single "XYZ line" This combined control line allows us to perform fast single-qubit gates as well as to deliver flux signals to the qubits.
  arXiv  Detail & Related papers  (2021-07-13T17:05:45Z)
• 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.