In-situ tunable superconducting diode: towards field-free operation with infinite nonreciprocity

• URL: http://arxiv.org/abs/2605.13254v1
• Date: Wed, 13 May 2026 09:37:52 GMT
• Title: In-situ tunable superconducting diode: towards field-free operation with infinite nonreciprocity
• Abstract summary: diodes based on four-terminal niobium planar Josephson junctions.<n>We show that the multiterminal structure eliminates the need for an external magnetic field and enables essentially unrestricted in-situ tunability.<n>For example, we demonstrate that such diodes can operate as Gauss neurons via reentrant superconductivity.
• Score: 0.0
• License: http://creativecommons.org/publicdomain/zero/1.0/
• Abstract: Efficient, scalable, and magnetic-field-free superconducting diodes are essential for future superconducting electronics; yet, despite significant efforts, such practical devices remain unrealized. The main challenge lies in achieving broad-range in-situ tunability, both for optimization and for achieving transistor-like operation. Here, we study diodes based on four-terminal niobium planar Josephson junctions. We show that the multiterminal structure eliminates the need for an external magnetic field and enables essentially unrestricted in-situ tunability, along with reconfigurability of the diode polarity, leading to new functionality. For example, we demonstrate that such diodes can operate as Gauss neurons via reentrant superconductivity. By deliberately tuning the junction parameters, we obtain effectively infinite nonreciprocity (within experimental resolution) leading to threshold-free ac-current rectification. Such technologically simple, reconfigurable, and broadly tunable diodes could be instrumental for future digital and neuromorphic computing.

Related papers

• Magnetically induced Josephson nano-diodes in field-resilient superconducting microwave circuits [0.0]
  We investigate niobium-based circuits with integrated nano-constriction quantum interferometers in magnetic in-plane fields up to several hundred mT.<n>Experiments reveal an unexpected and pronounced field-induced asymmetry in the bias-flux response of the circuits.<n>In the diode-state the circuit Kerr nonlinearity is bimodal in frequency, not only eliminating alternative explanations for the bias-flux-asymmetries.
  arXiv  Detail & Related papers  (2025-11-20T19:00:01Z)
• A transmon qubit realized by exploiting the superconductor-insulator transition [0.0]
  Superconducting qubits are among the most promising platforms for realizing practical quantum computers.<n>In this work, we exploit a thickness-driven superconductor-insulator transition to form a weak link employing only atomic layer deposition and atomic layer etching.<n>We produce a transmon qubit, '$planaron$', with a measured anharmonicity of $alpha/2pi = 235$ MHz; at present, the linewidth is $kappa/2pi = 15 mathrm: MHz$.
  arXiv  Detail & Related papers  (2025-10-22T19:29:01Z)
• Circuit-level-configurable Zero-field Superconducting Diodes: A Universal Platform Beyond Intrinsic Symmetry Breaking [20.175720084847537]
  Superconducting diode effect (SDE) with nonreciprocal supercurrent is the physical foundation of superconducting electronics.<n>Here, we demonstrate a field-free SDE due to the chemical potential shift from external circuit line resistance.<n>This SDE addresses critical challenges in dissipationless circuit towards application, and thus establishes a robust platform for scalable superconducting electronics.
  arXiv  Detail & Related papers  (2025-05-23T19:38:41Z)
• Electron-Electron Interactions in Device Simulation via Non-equilibrium Green's Functions and the GW Approximation [71.63026504030766]
  electron-electron (e-e) interactions must be explicitly incorporated in quantum transport simulation.<n>This study is the first one reporting large-scale atomistic quantum transport simulations of nano-devices under non-equilibrium conditions.
  arXiv  Detail & Related papers  (2024-12-17T15:05:33Z)
• Transport properties and quantum phase transitions in one-dimensional superconductor-ferromagnetic insulator heterostructures [44.99833362998488]
  We propose a one-dimensional electronic nanodevice inspired in recently fabricated semiconductor-superconductor-ferromagnetic insulator hybrids. We show that the device can be tuned across spin- and fermion parity-changing QPTs by adjusting the FMI layer length orange and/or by applying a global backgate voltage. Our findings suggest that these effects are experimentally accessible and offer a robust platform for studying quantum phase transitions in hybrid nanowires.
  arXiv  Detail & Related papers  (2024-10-18T22:25:50Z)
• Extracting the current-phase-relation of a monolithic three-dimensional nano-constriction using a DC-current-tunable superconducting microwave cavity [0.0]
  We present a niobium microwave cavity with a monolithically integrated, neon-ion-beam patterned 3D nano-constriction. By design, we obtain a DC-current-tunable microwave circuit and characterize how the bias-current-dependent constriction properties impact the cavity resonance. Our platform provides a useful method to comprehensively characterize nonlinear elements integrated in microwave circuits.
  arXiv  Detail & Related papers  (2024-02-15T19:02:49Z)
• Realizing Majorana Kramers pairs in two-channel InAs-Al nanowires with highly misaligned electric fields [0.0]
  We propose an experimentally favorable scheme for realizing field-free topological superconductivity, in two-channel InAs-Al nanowires. We show that antiparallel fields are not required, if the channels are energetically detuned. This work, therefore, solves a major technical challenge and opens the door to near-term experiments.
  arXiv  Detail & Related papers  (2023-04-14T17:55:58Z)
• 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)
• Silicide-based Josephson field effect transistors for superconducting qubits [0.0]
  An alternative "gatemon" qubit has recently appeared, which uses hybrid superconducting/semiconducting (S/Sm) devices as gate-tuned Josephson junctions. A scalable gatemon design could be made with CMOS Josephson Field-Effect Transistors as tunable weak link. A successful gate modulation of Andreev current in a silicon-based transistor represents a step towards fully CMOS-integrated superconducting quantum computers.
  arXiv  Detail & Related papers  (2022-09-06T18:00:03Z)
• 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)
• A low-loss ferrite circulator as a tunable chiral quantum system [108.66477491099887]
  We demonstrate a low-loss waveguide circulator constructed with single-crystalline yttrium iron garnet (YIG) in a 3D cavity. We show the coherent coupling of its chiral internal modes with integrated superconducting niobium cavities. We also probe experimentally the effective non-Hermitian dynamics of this system and its effective non-reciprocal eigenmodes.
  arXiv  Detail & Related papers  (2021-06-21T17:34:02Z)
• Coherent superconducting qubits from a subtractive junction fabrication process [48.7576911714538]
  Josephson tunnel junctions are the centerpiece of almost any superconducting electronic circuit, including qubits. In recent years, sub-micron scale overlap junctions have started to attract attention. This work paves the way towards a more standardized process flow with advanced materials and growth processes, and constitutes an important step for large scale fabrication of superconducting quantum circuits.
  arXiv  Detail & Related papers  (2020-06-30T14:52:14Z)
• Hardware-Encoding Grid States in a Non-Reciprocal Superconducting Circuit [62.997667081978825]
  We present a circuit design composed of a non-reciprocal device and Josephson junctions whose ground space is doubly degenerate and the ground states are approximate codewords of the Gottesman-Kitaev-Preskill (GKP) code. We find that the circuit is naturally protected against the common noise channels in superconducting circuits, such as charge and flux noise, implying that it can be used for passive quantum error correction.
  arXiv  Detail & Related papers  (2020-02-18T16:45:09Z)

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.