Nature Search

Observation of directly interacting coherent two-level systems in an amorphous material

Material defects create spurious two-level systems that are a source of noise in nanostructured devices. Lisenfeld et al.use a superconducting qubit to perform high-resolution defect spectroscopy, providing direct evidence of quantum coherent interaction between two defects.

Jürgen Lisenfeld
Grigorij J. Grabovskij
Alexey V. Ustinov
ResearchOpen Access05 Feb 2015
Nature Communications

Volume: 6, P: 1-6
Implementation of a quantum metamaterial using superconducting qubits

Superconducting flux qubits operating as two-level systems can act as artificial atoms, and so represent a potential metamaterial building block. Macha et al.assemble 20 such qubits into a metamaterial in which the ‘atoms’ are collectively coupled to the quantized mode of a microwave photon field.

Pascal Macha
Gregor Oelsner
Alexey V. Ustinov
Research14 Oct 2014
Nature Communications

Volume: 5, P: 1-6
Quantum emulation of the transient dynamics in the multistate Landau-Zener model

Alexander Stehli
Jan David Brehm
Alexey V. Ustinov
ResearchOpen Access24 Jun 2023
npj Quantum Information

Volume: 9, P: 1-5
Granular aluminium as a superconducting material for high-impedance quantum circuits

A fluxonium qubit is constructed out of granular aluminium, revealing its potential for superconducting quantum technologies.

Lukas Grünhaupt
Martin Spiecker
Ioan M. Pop
Research29 Apr 2019
Nature Materials

Volume: 18, P: 816-819
Quantum sensors for microscopic tunneling systems

Alexander Bilmes
Serhii Volosheniuk
Jürgen Lisenfeld
ResearchOpen Access05 Feb 2021
npj Quantum Information

Volume: 7, P: 1-6
Resolving the positions of defects in superconducting quantum bits

Alexander Bilmes
Anthony Megrant
Jürgen Lisenfeld
ResearchOpen Access20 Feb 2020
Scientific Reports

Volume: 10, P: 1-6
Electric field spectroscopy of material defects in transmon qubits

Jürgen Lisenfeld
Alexander Bilmes
Alexey V. Ustinov
ResearchOpen Access22 Nov 2019
npj Quantum Information

Volume: 5, P: 1-6
Decoherence spectroscopy with individual two-level tunneling defects

Jürgen Lisenfeld
Alexander Bilmes
Alexey V. Ustinov
ResearchOpen Access31 Mar 2016
Scientific Reports

Volume: 6, P: 1-8
Enhancing the coherence of superconducting quantum bits with electric fields

Jürgen Lisenfeld
Alexander Bilmes
Alexey V. Ustinov
ResearchOpen Access25 Jan 2023
npj Quantum Information

Volume: 9, P: 1-5
Polarization conversion when focusing cylindrically polarized vortex beams

Alexey P. Porfirev
Andrey V. Ustinov
Svetlana N. Khonina
ResearchOpen Access05 Dec 2016
Scientific Reports

Volume: 6, P: 1-9
Waveguide bandgap engineering with an array of superconducting qubits

Jan David Brehm
Alexander N. Poddubny
Alexey V. Ustinov
ResearchOpen Access04 Feb 2021
npj Quantum Materials

Volume: 6, P: 1-5
Rabi oscillations in a superconducting nanowire circuit

Yannick Schön
Jan Nicolas Voss
Alexey V. Ustinov
ResearchOpen Access13 Mar 2020
npj Quantum Materials

Volume: 5, P: 1-5
Two-level system hyperpolarization using a quantum Szilard engine

The performance of superconducting qubits is often limited by spurious two-level systems. Now, a qubit operating as a heat engine manipulates its bath of nearby two-level systems, providing insights into their dynamics and interactions.

Martin Spiecker
Patrick Paluch
Ioan M. Pop
Research08 Jun 2023
Nature Physics

Volume: 19, P: 1320-1325
Analog quantum simulation of the Rabi model in the ultra-strong coupling regime

An analog quantum simulation scheme has been explored with a quantum hardware based on a superconducting circuit. Here the authors investigate the time evolution of the quantum Rabi model at ultra-strong coupling conditions, which is synthesized by slowing down the system dynamics in an effective frame.

Jochen Braumüller
Michael Marthaler
Alexey V. Ustinov
ResearchOpen Access03 Oct 2017
Nature Communications

Volume: 8, P: 1-8
Readout error mitigated quantum state tomography tested on superconducting qubits

Significant efforts have been dedicated to mitigate gate errors in quantum devices, while comparatively little attention has been given to the increasing issue of readout errors. The authors present an explicit protocol for comprehensive readout error mitigation with quantum state tomography, and demonstrate its applicability experimentally on a superconducting qubit device.

Adrian Skasberg Aasen
Andras Di Giovanni
Martin Gärttner
ResearchOpen Access06 Sept 2024
Communications Physics

Volume: 7, P: 1-11
Dynamic electromagnonic crystal based on artificial multiferroic heterostructure

Fast and energy-efficient control of magnon transport in magnonic crystals is one of the main challenges of modern magnonics. High performances for voltage control are expected but have so far only been predicted theoretically and investigated numerically. In this paper, the authors report of the first experimental realization of voltage-controlled magnon currents in a dynamic electromagnonic crystal.

Alexey B. Ustinov
Andrei V. Drozdovskii
Boris A. Kalinikos
ResearchOpen Access01 Nov 2019
Communications Physics

Volume: 2, P: 1-7
Dynamical decoupling of quantum two-level systems by coherent multiple Landau–Zener transitions

Shlomi Matityahu
Hartmut Schmidt
Jürgen Lisenfeld
ResearchOpen Access18 Dec 2019
npj Quantum Information

Volume: 5, P: 1-7
Publisher Correction: Resolving the positions of defects in superconducting quantum bits

Alexander Bilmes
Anthony Megrant
Jürgen Lisenfeld
Amendments and CorrectionsOpen Access10 Mar 2020
Scientific Reports

Volume: 10, P: 1
Formation of hybrid higher-order cylindrical vector beams using binary multi-sector phase plates

Svetlana N. Khonina
Andrey V. Ustinov
Alexey P. Porfirev
ResearchOpen Access25 Sept 2018
Scientific Reports

Volume: 8, P: 1-11
Probing defect densities at the edges and inside Josephson junctions of superconducting qubits

Alexander Bilmes
Serhii Volosheniuk
Jürgen Lisenfeld
ResearchOpen Access07 Mar 2022
npj Quantum Information

Volume: 8, P: 1-6
Reflection-less width-modulated magnonic crystal

By modulating the dimensions of magnonic crystals, their transmission properties in the microwave regime may be tuned and so applications including information processing are anticipated. The authors here show reflection-less spin-wave propagation may be realised in a width-modulated waveguide.

Pascal Frey
Aleksei A. Nikitin
Alexander A. Serga
ResearchOpen Access22 Jan 2020
Communications Physics

Volume: 3, P: 1-7
Introducing coherent time control to cavity magnon-polariton modes

By connecting light and magnetism, the cavity magnon-polariton offers a link between quantum computing and spintronics. Here, an important step towards this goal is achieved by demonstrating a dynamic control over both subsystems with coherent microwave pulses on nanosecond timescales.

Tim Wolz
Alexander Stehli
Martin Weides
ResearchOpen Access03 Jan 2020
Communications Physics

Volume: 3, P: 1-6

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