Eoin O’Farrell

Interplay between multipolar order and multipole-induced superconductivity in PrTi2Al20

Akito Sakai, Y. Matsumoto, Mingxuan Fu, Takachika Isomae et autres

Multipolar moments entail a new route to tackle frontier problems in superconductivity (SC). A key progress in the search for multipolar SC is the discovery of PrTr2Al20 (Tr = Ti, V), which possesses quadrupolar and octupolar but no magnetic dipolar moments. The …

jp, de, ca, us (code pays fourni par la source)

Interferometric single-shot parity measurement in InAs–Al hybrid devices

Morteza Aghaee, Alejandro Alcaraz Ramirez, Zulfi Alam, Rizwan Ali et autres

The fusion of non-Abelian anyons is a fundamental operation in measurement-only topological quantum computation1. In one-dimensional topological superconductors (1DTSs)2–4, fusion amounts to a determination of the shared fermion parity of Majorana zero modes (MZMs). Here we introduce a device architecture5 that is …

us (code pays fourni par la source)

Roadmap to fault tolerant quantum computation using topological qubit arrays

Morteza Aghaee, Zulfi Alam, Mariusz Andrzejczuk, Andrey E. Antipov et autres

This data accompanies the preprint "Roadmap to fault tolerant quantum computation using topological qubit arrays" and contains simulation data used in the figures.

Supercurrent transport through 1e -periodic full-shell Coulomb islands

Davydas Razmadze, Rubén Seoane Souto, Eoin O’Farrell, Peter Krogstrup et autres

We experimentally investigate supercurrent through Coulomb islands, where island and leads are fabricated from semiconducting nanowires with fully surrounding superconducting shells. Applying flux along the wire yields a series of destructive Little-Parks lobes with reentrant supercurrent. We find Coulomb blockade with $2e$ …

dk, es, se (code pays fourni par la source)

Interferometric Single-Shot Parity Measurement in an InAs-Al Hybrid Device

Morteza Aghaee, Alejandro Alcaraz Ramirez, Zulfi Alam, Rizwan Ali et autres

The fusion of non-Abelian anyons or topological defects is a fundamental operation in measurement-only topological quantum computation. In topological superconductors, this operation amounts to a determination of the shared fermion parity of Majorana zero modes. As a step towards this, we implement …

Supercurrent transport through 1$e$-periodic full-shell Coulomb islands

Davydas Razmadze, Rubén Seoane Souto, Eoin O’Farrell, Peter Krogstrup et autres

We experimentally investigate supercurrent through Coulomb islands, where island and leads are fabricated from semiconducting nanowires with fully surrounding superconducting shells. Applying flux along the wire yields a series of destructive Little-Parks lobes with reentrant supercurrent. We find Coulomb blockade with 2$e$ …

dk, us, es, se (code pays fourni par la source)

Electrostatic control of quasiparticle poisoning in a hybrid semiconductor-superconductor island

Hung Q. Nguyen, Deividas Sabonis, Davydas Razmadze, E. T. Mannila et autres

The performance of superconducting devices is often degraded by the uncontrolled appearance and disappearance of quasiparticles, a process known as poisoning. We demonstrate the electrostatic control of quasiparticle poisoning in the form of single-charge tunneling across a fixed barrier onto a Coulomb …

dk, vn, fi, se (code pays fourni par la source)

InAs-Al hybrid devices passing the topological gap protocol

Morteza Aghaee, Arun Akkala, Zulfi Alam, Rizwan Ali et autres

Topological phases of matter can enable highly stable qubits with small footprints, fast gate times, and digital control. These hardware-protected qubits must be fabricated with a material combination in which a topological phase can reliably be induced. The challenge: disorder can destroy …

us (code pays fourni par la source)

InAs-Al Hybrid Devices Passing the Topological Gap Protocol

Morteza Aghaee, Arun Akkala, Zulfi Alam, Rizwan Ali et autres

We present measurements and simulations of semiconductor-superconductor heterostructure devices that are consistent with the observation of topological superconductivity and Majorana zero modes. The devices are fabricated from high-mobility two-dimensional electron gases in which quasi-one-dimensional wires are defined by electrostatic gates. These devices …

Anisotropy-driven quantum criticality in an intermediate valence system

Mihael S. Grbić, Eoin O’Farrell, Y. Matsumoto, Kentaro Kuga et autres

Abstract Intermetallic compounds containing f-electron elements have been prototypical materials for investigating strong electron correlations and quantum criticality (QC). Their heavy fermion ground state evoked by the magnetic f-electrons is susceptible to the onset of quantum phases, such as magnetism or superconductivity, …

hr, jp, de, us, gb (code pays fourni par la source)

Electrostatic control of quasiparticle poisoning in a hybrid semiconductor-superconductor island

H. Q. Nguyen, Deividas Sabonis, Davydas Razmadze, E. T. Mannila et autres

The performance of superconducting devices is often degraded by the uncontrolled appearance and disappearance of quasiparticles, a process known as poisoning. We demonstrate electrostatic control of quasiparticle poisoning in the form of single-charge tunneling across a fixed barrier onto a Coulomb island …

Comparing tunneling spectroscopy and charge sensing of Andreev bound states in a semiconductor-superconductor hybrid nanowire structure

Deividas Sabonis, David Van Zanten, Judith Suter, Torsten Karzig et autres

Transport studies of Andreev bound states (ABSs) are complicated by the interplay of charging effects and superconductivity. Here, we compare transport approaches to ABS spectroscopy in a semiconductor-superconductor island to a charge-sensing approach based on an integrated radio-frequency single-electron transistor. Consistency of …