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arxiv: 2511.20758 · v2 · submitted 2025-11-25 · 🪐 quant-ph

Nonreciprocal quantum information processing with superconducting diodes in circuit quantum electrodynamics

Nicolas Dirnegger , Prineha Narang , Arpit Arora This is my paper

Pith reviewed 2026-05-17 04:46 UTC · model grok-4.3

classification 🪐 quant-ph
keywords superconducting diodenonreciprocal couplingcircuit quantum electrodynamicstwo-qubit gatesasymmetric SQUIDquantum information processingflux bias control
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The pith

Superconducting diodes enable nonreciprocal half-iSWAP operations between qubits in circuit QED.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper establishes that superconducting diodes, realized as flux-biased asymmetric SQUIDs, can function as coherent nonreciprocal elements within circuit quantum electrodynamics setups. These diodes produce direction-dependent resonance shifts and allow a minimal two-qubit system to perform a nonreciprocal half-iSWAP gate. A sympathetic reader would care because this embeds nonreciprocity directly at the hardware level, which could support high-fidelity signal routing and entanglement generation in microwave quantum networks without separate bulky components. If correct, the approach turns intrinsic diode nonlinearity into a practical tool for directional quantum operations.

Core claim

An asymmetric SQUID operated as a superconducting diode under flux bias induces direction-dependent resonance shifts in the transmission spectrum and serves as a coupler that realizes coherent nonreciprocal qubit-qubit coupling. In a minimal two-qubit system this yields a nonreciprocal half-iSWAP, demonstrating that intrinsic nonreciprocity can be used to perform arbitrary two-qubit gates.

What carries the argument

Flux-biased asymmetric SQUID acting as a superconducting diode that supplies tunable, direction-dependent isolation and coherent coupling.

If this is right

  • Even modest diode efficiency produces isolation ratios high enough for practical use, and the ratio improves when multiple diodes are combined.
  • Nonreciprocal qubit-qubit coupling permits coherent operations such as the half-iSWAP without unwanted reciprocal interference.
  • Microwave quantum networks can embed nonreciprocity at the device level to enable high-fidelity signal routing and entanglement generation in all-to-all connected architectures.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Larger arrays of such diodes could enforce directional information flow that reduces crosstalk in scaled quantum processors.
  • The single-control-handle design might allow dynamic reconfiguration of coupling directions during algorithm execution.
  • Integration with existing cQED fabrication processes could lower the overhead currently required for external isolators or circulators.

Load-bearing premise

The flux bias acts cooperatively with the nonlinear diode response to produce usable isolation and coherent coupling without introducing excessive decoherence or loss in the cQED architecture.

What would settle it

Spectroscopic data or two-qubit gate tomography showing that the coupling remains reciprocal and the half-iSWAP fidelity does not improve when the flux bias is applied to the diode.

Figures

Figures reproduced from arXiv: 2511.20758 by Arpit Arora, Nicolas Dirnegger, Prineha Narang.

Figure 1
Figure 1. Figure 1: FIG. 1: Superconducting diode (SD) and nonreciprocal qubit [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2: Spectroscopic characterization of superconducting diode on a two-port network: (a) Transmission spectrum at fixed [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3: Coherent control of population dynamics via effective qubit-qubit coupling through SD and dynamic evolution of [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4: Bell state tomographic representation of density matrices of the qubit pairs via linear reconstruction after half-iSWAP [PITH_FULL_IMAGE:figures/full_fig_p005_4.png] view at source ↗
read the original abstract

Introducing new components and functionalities into quantum devices is critical in advancing state-of-the-art hardware. Here, we propose superconducting diodes (SDs) as a coherent nonreciprocal element in circuit quantum electrodynamics (cQED) architectures. In particular, we use an asymmetric SQUID as an SD controlled with a flux bias - nonreciprocal element with single control handle and on-chip modality. We spectroscopically characterize SD and show that flux bias acts cooperatively with the nonlinear diode response to induce direction-dependent resonance shifts in the transmission spectrum. We show that even with modest diode efficiency the isolation isolation ratio is sufficiently high, and scales with multiple SDs. We demonstrate the use of the SD as a coupler to realize coherent nonreciprocal qubit-qubit coupling. With a minimal two qubit system, we demonstrate nonreciprocal half-iSWAP, thereby showcasing the potential of intrinsic nonreciprocity as a tool to perform arbitrary two-qubit gates. Our work enables high-fidelity signal routing and entanglement generation in all-to-all connected microwave quantum networks, where nonreciprocity is embedded at the device level.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 1 minor

Summary. The manuscript proposes superconducting diodes (SDs) realized with flux-biased asymmetric SQUIDs as coherent nonreciprocal elements in cQED architectures. Spectroscopic characterization shows that flux bias cooperates with the nonlinear diode response to produce direction-dependent resonance shifts in transmission. The work claims that modest diode efficiency yields sufficiently high isolation ratios that scale with multiple SDs. The SD is then employed as a coupler to realize coherent nonreciprocal qubit-qubit coupling, with an explicit demonstration of a nonreciprocal half-iSWAP gate in a minimal two-qubit system. This is presented as enabling arbitrary two-qubit gates and high-fidelity signal routing in all-to-all microwave quantum networks.

Significance. If the claims are substantiated, the work would provide a device-level solution for nonreciprocity in quantum circuits, potentially simplifying architectures by removing reliance on external circulators. The scaling of isolation and the two-qubit gate demonstration illustrate how intrinsic nonreciprocity can be leveraged for entanglement generation and signal routing in cQED networks.

major comments (1)
  1. The central claim of usable coherent nonreciprocal coupling for the half-iSWAP demonstration rests on the assumption that the flux-biased SD does not introduce excess loss or dephasing channels. No quantitative data on qubit T1/T2 times or gate fidelity at the operating bias point are reported to support this, which directly bears on whether the effective coupling remains coherent on gate timescales.
minor comments (1)
  1. Abstract: repeated word 'isolation isolation ratio' should be corrected to 'isolation ratio'.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading of the manuscript and for identifying this important point regarding the coherence of the nonreciprocal coupling. We address the comment below and outline the revisions we will make.

read point-by-point responses

  1. Referee: The central claim of usable coherent nonreciprocal coupling for the half-iSWAP demonstration rests on the assumption that the flux-biased SD does not introduce excess loss or dephasing channels. No quantitative data on qubit T1/T2 times or gate fidelity at the operating bias point are reported to support this, which directly bears on whether the effective coupling remains coherent on gate timescales.

    Authors: We agree that explicit quantification of qubit coherence at the operating flux bias strengthens the claim of coherent nonreciprocal coupling. The successful demonstration of the nonreciprocal half-iSWAP gate in the two-qubit system already indicates that the effective coupling supports coherent evolution on the relevant timescales, as incoherent channels would preclude the observed directional phase accumulation and gate operation. Nevertheless, we acknowledge the value of direct T1/T2 data. In the revised manuscript we will include measurements of qubit relaxation and dephasing times at the flux bias points used for the diode characterization and gate demonstration, together with a comparison to the zero-bias case and an estimate of the effective gate fidelity extracted from the observed dynamics. revision: yes

Circularity Check

0 steps flagged

No circularity detected in derivation or claims

full rationale

The paper advances a proposal for using flux-biased asymmetric SQUIDs as superconducting diodes to enable nonreciprocal coupling in cQED, with claims resting on spectroscopic characterization showing direction-dependent resonance shifts, scaling of isolation ratio, and a demonstrated nonreciprocal half-iSWAP in a minimal two-qubit system. No equations, fitted parameters, or self-citations are referenced in the provided text that would reduce the central results to inputs by construction, self-definition, or load-bearing prior work by the same authors. The logic chain is presented as grounded in device physics and experimental outcomes rather than any renaming, ansatz smuggling, or prediction-from-fit structure, rendering the derivation self-contained.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Abstract-only review limits visibility into parameters or assumptions; the proposal implicitly relies on standard cQED circuit models and diode nonlinearity without explicit new entities or fitted constants stated.

axioms (1)
  • domain assumption Standard circuit quantum electrodynamics Hamiltonian and coupling assumptions hold for the asymmetric SQUID device.
    Invoked implicitly when describing resonance shifts and qubit coupling.

pith-pipeline@v0.9.0 · 5499 in / 1127 out tokens · 31981 ms · 2026-05-17T04:46:21.777364+00:00 · methodology

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Forward citations

Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Nanoscale electrothermal-switch superconducting diode for electrically programmable superconducting circuits

    cond-mat.supr-con 2026-04 unverdicted novelty 6.0

    A lithography-compatible electrothermal-switch superconducting diode achieves up to 60% efficiency and can be electrically programmed on, off, or reversed for use in scalable superconducting electronics.

  2. Quantum Landscape of Superconducting Diodes

    cond-mat.supr-con 2026-04 unverdicted novelty 3.0

    Superconducting diodes can provide built-in nonlinearity, nonreciprocity, and quantum features to support scalable, integrated superconducting quantum circuits with improved thermal compatibility.

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