Daniel Jirovec

Delft University of Technology

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Georgios Katsaros

Institute of Science and Technology Austria

Daniel Chrastina

Politecnico di Milano

Menno Veldhorst

Delft University of Technology

Amir Sammak

Netherlands Organisation for Applied Scientific Research

Giovanni Isella

Politecnico di Milano

Giordano Scappucci

Delft University of Technology

Natalia Ares

University of Oxford

Stefan D. Oosterhout

Netherlands Organisation for Applied Scientific Research

Tzu-Kan Hsiao

National Tsing Hua University

Xin Zhang

Hangzhou Special Equipment Inspection and Research Institute

Cooperative Institutions

Delft University of Technology

University of Oxford

QuTech

University of Basel

Institute of Science and Technology Austria

ETH Zurich

Centre National de la Recherche Scientifique

Politecnico di Milano

RWTH Aachen University

Universitat Autònoma de Barcelona

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Universal control of four singlet-triplet qubits

Research Square (Research Square) (2024)

L. M. K. Vandersypen Xin Zhang Elizaveta Morozova Maximilian Russ Daniel Jirovec

Abstract The coherent control of interacting spins in semiconductor quantum dots is of strong interest for quantum information processing as well as for studying quantum magnetism from the bottom up. On paper, individual spin-spin couplings can be independently controlled through gate voltages, but nonlinearities and crosstalk introduce significant complexity that has slowed down progress in past years. Here, we present a 2×4 germanium quantum dot array with full and controllable interactions between nearest-neighbor spins. As a demonstration of the level of control, we define four singlet-triplet qubits in this system and show two-axis single-qubit control of each qubit and SWAP-style two-qubit gates between all neighbouring qubit pairs. Combining these operations, we experimentally implement a circuit designed to generate and distribute entanglement across the array. These results highlight the potential of singlet-triplet qubits as a competing platform for quantum computing and indicate that scaling up the control of quantum dot spins in extended bilinear arrays can be feasible.

10.21203/rs.3.rs-3820596/v1

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Superconductor-Semiconductor Devices with 2D Holes in Germanium

Bulletin of the American Physical Society (2020)

Kushagra Aggarwal Andrea Hofmann Daniel Jirovec Iván González Amir Sammak

Germanium compounds

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Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet qubits

arXiv (Cornell University) (2019)

Andrea Hofmann Daniel Jirovec Maxim Borovkov Iván Prieto Andrea Ballabio

We study double quantum dots in a Ge/SiGe heterostructure and test their maturity towards singlet-triplet ($S-T_0$) qubits. We demonstrate a large range of tunability, from two single quantum dots to a double quantum dot. We measure Pauli spin blockade and study the anisotropy of the $g$-factor. We use an adjacent quantum dot for sensing charge transitions in the double quantum dot at interest. In conclusion, Ge/SiGe possesses all ingredients necessary for building a singlet-triplet qubit.

Pauli exclusion principle

10.48550/arxiv.1910.05841

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Exciton Transport in a Germanium Quantum Dot Ladder

Physical Review X (2024)

Tzu-Kan Hsiao Pablo Cova Fariña Stefan D. Oosterhout Daniel Jirovec Xin Zhang

Quantum systems with engineered Hamiltonians can be used to study many-body physics problems to provide insights beyond the capabilities of classical computers. Semiconductor gate-defined quantum dot arrays have emerged as a versatile platform for realizing generalized Fermi-Hubbard physics, one of the richest playgrounds in condensed matter physics. In this work, we employ a germanium 4×2 quantum dot array and show that the naturally occurring long-range Coulomb interaction can lead to exciton formation and transport. We tune the quantum dot ladder into two capacitively coupled channels and exploit Coulomb drag to probe the binding of electrons and holes. Specifically, we shuttle an electron through one leg of the ladder and observe that a hole is dragged along in the second leg under the right conditions. This corresponds to a transition from single-electron transport in one leg to exciton transport along the ladder. Our work paves the way for the study of excitonic states of matter in quantum dot arrays.7 MoreReceived 5 July 2023Revised 8 December 2023Accepted 5 February 2024DOI:https://doi.org/10.1103/PhysRevX.14.011048Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasExcitonsQuantum simulationPhysical SystemsQuantum dotsSemiconductorsStrongly correlated systemsQuantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics

Biexciton

10.1103/physrevx.14.011048

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Automated long-range compensation of an rf quantum dot sensor

arXiv (Cornell University) (2023)

Joseph Hickie Barnaby van Straaten Federico Fedele Daniel Jirovec Andrea Ballabio

Charge sensing is a sensitive technique for probing quantum devices, of particular importance for spin qubit readout. To achieve good readout sensitivities, the proximity of the charge sensor to the device to be measured is a necessity. However, this proximity also means that the operation of the device affects, in turn, the sensor tuning and ultimately the readout sensitivity. We present an approach for compensating for this cross-talk effect allowing for the gate voltages of the measured device to be swept in a 1 V x 1 V window while maintaining a sensor configuration chosen by a Bayesian optimiser. Our algorithm is a key contribution to the suite of fully automated solutions required for the operation of large quantum device architectures.

10.48550/arxiv.2310.02135

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Dataset underlying the manuscript: Universal control of four singlet-triplet qubits

Zenodo (CERN European Organization for Nuclear Research) (2023)

Xin Zhang Elizaveta Morozova Maximilian Russ Daniel Jirovec Tzu-Kan Hsiao

Original dataset for the paper "Universal control of four singlet-triplet qubits" by Xin Zhang et al (https://arxiv.org/abs/2312.16101).

Singlet fission

10.5281/zenodo.10431401

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All rf-based tuning algorithm for quantum devices using machine learning

arXiv (Cornell University) (2022)

Barnaby van Straaten Federico Fedele Florian Vigneau Joseph Hickie Daniel Jirovec

Radio-frequency measurements could satisfy DiVincenzo's readout criterion in future large-scale solid-state quantum processors, as they allow for high bandwidths and frequency multiplexing. However, the scalability potential of this readout technique can only be leveraged if quantum device tuning is performed using exclusively radio-frequency measurements i.e. without resorting to current measurements. We demonstrate an algorithm that automatically tunes double quantum dots using only radio-frequency reflectometry. Exploiting the high bandwidth of radio-frequency measurements, the tuning was completed within a few minutes without prior knowledge about the device architecture. Our results show that it is possible to eliminate the need for transport measurements for quantum dot tuning, paving the way for more scalable device architectures.

Reflectometry

10.48550/arxiv.2211.04504

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Data for 'Exciton transport in a germanium quantum dot ladder' by Tzu-Kan Hsiao et al.

Zenodo (CERN European Organization for Nuclear Research) (2023)

Tzu-Kan Hsiao Pablo Cova Fari ̃na Stefan D. Oosterhout Daniel Jirovec Xin Zhang

Data for 'Exciton transport in a germanium quantum dot ladder' by Tzu-Kan Hsiao et al.

10.5281/zenodo.8105397

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Automated long-range compensation of an rf quantum dot sensor

Physical Review Applied (2024)

Joseph Hickie Barnaby van Straaten Federico Fedele Daniel Jirovec Andrea Ballabio

Charge sensing is a sensitive technique for probing quantum devices, of particular importance for spin-qubit readout. To achieve good readout sensitivities, the proximity of the charge sensor to the device to be measured is a necessity. However, this proximity also means that the operation of the device affects, in turn, the sensor tuning and ultimately the readout sensitivity. We present an approach for compensating for this crosstalk effect allowing for the gate voltages of the measured device to be swept in a 1-V × 1-V window while maintaining a sensor configuration chosen by a Bayesian optimizer. Our algorithm will hopefully be a major contribution to the suite of fully automated solutions required for the operation of large quantum device architectures. Published by the American Physical Society 2024

10.1103/physrevapplied.22.064026

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Citations (1)

Data for 'Exciton transport in a germanium quantum dot ladder' by Tzu-Kan Hsiao et al.

Zenodo (CERN European Organization for Nuclear Research) (2023)

Tzu-Kan Hsiao Pablo Cova Fari ̃na Stefan D. Oosterhout Daniel Jirovec Xin Zhang

Data for 'Exciton transport in a germanium quantum dot ladder' by Tzu-Kan Hsiao et al.

10.5281/zenodo.8105396

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