Josephson effect ≈ Josephson effect
View article: Circuit quantum electrodynamics
Circuit quantum electrodynamics Open
Quantum mechanical effects at the macroscopic level were first explored in\nJosephson junction-based superconducting circuits in the 1980's. In the last\ntwenty years, the emergence of quantum information science has intensified\nresearch …
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Introduction to quantum electromagnetic circuits Open
Summary The article is a short opinionated review of the quantum treatment of electromagnetic circuits, with no pretension to exhaustiveness. This review, which is an updated and modernized version of a previous set of Les Houches School l…
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Josephson diode effect from Cooper pair momentum in a topological semimetal Open
Cooper pairs in non-centrosymmetric superconductors can acquire finite centre-of-mass momentum in the presence of an external magnetic field. Recent theory predicts that such finite-momentum pairing can lead to an asymmetric critical curre…
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Topological Superconductivity in a Planar Josephson Junction Open
We consider a two-dimensional electron gas with strong spin-orbit coupling\ncontacted by two superconducting leads, forming a Josephson junction. We show\nthat in the presence of an in-plane Zeeman field the quasi-one-dimensional\nregion b…
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Ultralow power artificial synapses using nanotextured magnetic Josephson junctions Open
Clustered ferromagnetic Josephson junctions form ultralow energy synaptic elements.
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Bistability in a Driven-Dissipative Superfluid Open
We experimentally study a driven-dissipative Josephson junction array, realized with a weakly interacting Bose-Einstein condensate residing in a one-dimensional optical lattice. Engineered losses on one site act as a local dissipative proc…
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Superconductor digital electronics: Scalability and energy efficiency issues (Review Article) Open
Superconductor digital electronics using Josephson junctions as ultrafast switches and magnetic-flux encoding of information was proposed over 30 years ago as a sub-terahertz clock frequency alternative to semiconductor electronics based o…
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Ubiquitous Superconducting Diode Effect in Superconductor Thin Films Open
The macroscopic coherence in superconductors supports dissipationless supercurrents that could play a central role in emerging quantum technologies. Accomplishing unequal supercurrents in the forward and backward directions would enable un…
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Universal Josephson diode effect Open
We propose a universal mechanism for the Josephson diode effect in short Josephson junctions. The proposed mechanism is due to finite Cooper pair momentum and is a manifestation of simultaneous breaking of inversion and time-reversal symme…
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Direct Microwave Measurement of Andreev-Bound-State Dynamics in a Semiconductor-Nanowire Josephson Junction Open
The modern understanding of the Josephson effect in mesosopic devices derives from the physics of Andreev bound states, fermionic modes that are localized in a superconducting weak link. Recently, Josephson junctions constructed using semi…
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Josephson Diode Effect in Supercurrent Interferometers Open
A Josephson diode is a nonreciprocal circuit element that supports a larger dissipationless supercurrent in one direction than in the other. In this Letter, we propose a class of Josephson diodes based on supercurrent interferometers compo…
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Introduction to parametric amplification of quantum signals with Josephson circuits Open
This short and opinionated review starts with the concept of quantum signals at microwave frequencies and focuses on the principle of linear parametric amplification. This process emerges from the dispersive nonlinearity of Josephson junct…
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Second-Order Topological Superconductivity in -Junction Rashba Layers Open
We consider a Josephson junction bilayer consisting of two tunnel-coupled two-dimensional electron gas layers with Rashba spin-orbit interaction, proximitized by a top and bottom s-wave superconductor with phase difference ϕ close to π. We…
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Josephson Radiation from Gapless Andreev Bound States in HgTe-Based Topological Junctions Open
Frequency analysis of the rf emission of oscillating Josephson supercurrent is a powerful passive way of probing properties of topological Josephson junctions. In particular, measurements of the Josephson emission enable the detection of t…
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Symmetry-broken Josephson junctions and superconducting diodes in magic-angle twisted bilayer graphene Open
The coexistence of gate-tunable superconducting, magnetic and topological orders in magic-angle twisted bilayer graphene provides opportunities for the creation of hybrid Josephson junctions. Here we report the fabrication of gate-defined …
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Superconductor Electronics: Status and Outlook Open
Superconductor electronics combines passive and active superconducting components and sometimes normal resistors into functional circuits and systems that also include room-temperature electronics for amplification, power sources, necessar…
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Phase Signature of Topological Transition in Josephson Junctions Open
Topological superconductivity holds promise for fault-tolerant quantum computing. While planar Josephson junctions are attractive candidates to realize this exotic state, direct phase measurements as the fingerprint of the topological tran…
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General Theory of Josephson Diodes Open
Motivated by recent progress in the superconductivity nonreciprocal phenomena, we study the general theory of Josephson diodes. The central ingredient for Josephson diodes is the asymmetric proximity process inside the tunneling barrier. F…
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Relaxation to a Phase-Locked Equilibrium State in a One-Dimensional Bosonic Josephson Junction Open
We present an experimental study on the nonequilibrium tunnel dynamics of two coupled one-dimensional Bose-Einstein quasicondensates deep in the Josephson regime. Josephson oscillations are initiated by splitting a single one-dimensional c…
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Gate-tunable superconducting diode effect in a three-terminal Josephson device Open
The phenomenon of non-reciprocal critical current in a Josephson device, termed the Josephson diode effect, has garnered much recent interest. Realization of the diode effect requires inversion symmetry breaking, typically obtained by spin…
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Autonomous quantum refrigerator in a circuit QED architecture based on a Josephson junction Open
An implementation of a small quantum absorption refrigerator in a circuit QED architecture is proposed. The setup consists of three harmonic oscillators coupled to a Josephson junction. The refrigerator is autonomous in the sense that it d…
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Josephson Traveling-Wave Parametric Amplifier with Three-Wave Mixing Open
We develop a concept of the traveling-wave Josephson parametric amplifier exploiting quadratic nonlinearity of a serial array of one-junction SQUIDs embedded in a superconducting transmission line. The external magnetic flux applied to the…
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Ultra-fast vortex motion in a direct-write Nb-C superconductor Open
The ultra-fast dynamics of superconducting vortices harbors rich physics generic to nonequilibrium collective systems. The phenomenon of flux-flow instability (FFI), however, prevents its exploration and sets practical limits for the use o…
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Improving wafer-scale Josephson junction resistance variation in superconducting quantum coherent circuits Open
Quantum bits, or qubits, are an example of coherent circuits envisioned for next-generation computers and detectors. A robust superconducting qubit with a coherent lifetime of O (100 µs) is the transmon: a Josephson junction functioning as…
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Majorana splitting from critical currents in Josephson junctions Open
A semiconducting nanowire with strong Rashba spin-orbit coupling and coupled to a superconductor can be tuned by an external Zeeman field into a topological phase with Majorana zero modes. Here we theoretically investigate how this exotic …
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Characterization and reduction of capacitive loss induced by sub-micron Josephson junction fabrication in superconducting qubits Open
Josephson junctions form the essential non-linearity for almost all superconducting qubits. The junction is formed when two superconducting electrodes come within ∼1 nm of each other. Although the capacitance of these electrodes is a small…
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Andreev reflection at the altermagnet-superconductor interface Open
Altermagnets are a new class of magnetic materials, which exhibit large spin splitting, but due to the combined spin and real space group symmetry protection maintain zero net macroscopic magnetization. Such a characteristic may prove them…
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Josephson Diode Effect in High-Mobility InSb Nanoflags Open
We report nonreciprocal dissipation-less transport in single ballistic InSb nanoflag Josephson junctions. Applying an in-plane magnetic field, we observe an inequality in supercurrent for the two opposite current propagation directions. Th…
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Nanowire Superinductance Fluxonium Qubit Open
We characterize a fluxonium qubit consisting of a Josephson junction\ninductively shunted with a NbTiN nanowire superinductance. We explain the\nmeasured energy spectrum by means of a multimode theory accounting for the\ndistributed nature…
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Quantum heat engine based on photon-assisted Cooper pair tunneling Open
We propose and analyze a simple mesoscopic quantum heat engine that exhibits\nboth high-power and high-efficiency. The system consists of a biased Josephson\njunction coupled to two microwave cavities, with each cavity coupled to a\ntherma…