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Leistungen
In order to investigate crosstalk and find strategies to mitigate it we are going to investigate whether oscillating electric fields on neighboring qubits can lead to off-resonant Rabi oscillations and therefore decreased fidelities. We are going to perform randomized benchmarking on qubit1 with its neighboring qubit (qubit2) either in the idle state or with an oscillating electric field applied to one of its electrodes.We will investigate the fidelity dependence on the amplitude of the applied oscillating electric field and seek for best possible designs mitigating the crosstalk. Similarly, for the two-qubit gate we are going to investigate its fidelity on the status of the neighboring qubit3, i.e. whether it is idle or driven.
Report on electrical characterization (öffnet in neuem Fenster)Systematic electrical characterisation of quick turn monitors will be carried out by the different characterisation teams according to specific expertise, scientific interest and existing collaborations. Definition of a set of common metrics and targets will facilitate knowledge exchange and accelerate progress.
Gate set protocol for fault tolerant operation (öffnet in neuem Fenster)Randomized benchmarking measurements will be performed on quantum dot arrays in order to obtain insight into fidelity and its variability from qubit to qubit. On the theory side we are going to model electron-phonon, hyperfine, spin-orbit interaction and charge noise in order to understand their effect on qubit benchmarks. The goal is to enable the interpretation of experiments and to provide feedback and guidelines for optimized device design.
Fabricated 64-qubit processors (öffnet in neuem Fenster)64-qubit-devices will be realized on coupons from 100mm and 300mm wafers with multi-layer gates using electron-beam lithography, atomic layer deposition and metal deposition.
Perspective on germanium qubit operation. (öffnet in neuem Fenster)Perspective on germanium qubit operation based on all findings of the work package quantum devices.
Demonstration with documentation of automated tuning and gate calibration of quantum chip (öffnet in neuem Fenster)* Scalability-testing using autonomous operation of a 64-qubit quantum processor* Benchmarking crosstalk mitigation results* Ensuring seamless operation and implementation of WP4 algorithms on the entire classical and quantum stack, including cryogenic multiplexer and chip package and room-temperature hardware.
Readout and initialization fidelities optimization (öffnet in neuem Fenster)Readout will be based on latched Pauli-spin blockade. As the avoided crossing, and therefore the high fidelity fast initialization, depend on spin-orbit interaction, magnetic field and g-factor differences we will investigate the initialization fidelity versus electric and magnetic field and desing tailored pulses to avoid populating excited states.
Qubit realization exceeding quality factors of 500 (öffnet in neuem Fenster)Characterization of spin coherence (T1,T2*,T2) and Rabi driving (optimial driving, role of spin-orbit coupling) in connection to qubit layout.
Feedback on qubit properties (öffnet in neuem Fenster)WP3,4 will provide regular feedback on qubit benchmarking. This feedback will complete the learning cycle on materials and devices development and provide guidelines for design and process optimization.
Report followed by publication of quantum advantage demonstration experiment (öffnet in neuem Fenster)*Anomaly detection demonstration using a quantum classifier by using a 16 and 64 qubit processor* Random sampling algorithm on 64 qubit processor or subsystem* Evaluation of further algorithms and algorithm classes optimum for intermediate-scale germanium quantum processors
Report on full blueprint including layout of quantum chip, coherent interconnects and classical hardware, elaborated by publication concerning the developed architecture (öffnet in neuem Fenster)* Based on input from all other work packages, development of specific quantum-level modular architecture for two-dimensional qubit array* Demonstration of long-range (>100 μm) two-qubit gates with high fidelity via coherent interconnects between different qubit modules, based on superconducting materials developed in WP3* Full-layout of 64-qubit quantum device chip to industrial partner for deploying into industrial fab fabrication process
Report on crosstalk mitigation in intermediate and large-scale devices (öffnet in neuem Fenster)* Quantify crosstalk on the <12 qubits chips via simultaneous randomized benchmarking and compare to the theoretical simulation* Implement adaptive mitigation strategy to minimize the crosstalk as measured via simultaneous randomized benchmarking
Report on benchmarking of machine learning tuning models on the intermediate scale devices (öffnet in neuem Fenster)* Test the machine learning models on previously measured data and benchmark against numerical simulations for < 12 quantum dots.* Run the on-device tuning for intermediate scale < 12 qubit systems. Analyze the tuning speed and benchmark against human operators.
Open-source shared training sets for quantum dot control machine learning algorithms (öffnet in neuem Fenster)Use system-specific theoretical models produced in WP3 to generate labeled data sets for classically simulatable system sizes (< 12 quantum dots)* Develop geometric graph-based translationally invariant machine learning models and benchmark them on the theoretically generated data sets.
Report on error-correction demonstration, identification of errors and optimum errormitigation strategy (öffnet in neuem Fenster)* Modular benchmarking and error-detection for 10-or-fewer qubit processor including classical simulation* Error correction modelling; hardware-specific computation of error syndromes and noise correlations on limited-connectivity and error-prone processors (UKONZ, BUDA)* Surface-code error-detection and correction on 16 or 64 qubit processor or subsystem* Fault tolerant/ logical qubit
Annual report (öffnet in neuem Fenster)Annual report with latest material developments and resources information. Also month 24 and 36.
Perspective on strained germanium heterostructure engineering (öffnet in neuem Fenster)Perspective on strained germanium heterostructure engineering.
Tune, calibrate and mitigate crosstalk within the intermediate size subsets of a 64- qubit quantum processor (öffnet in neuem Fenster)* Apply translationally invariant geometric tuning methods on the data from large-scale 64 qubit quantum system. Analyze the speed and efficiency of tuning using quality of the measured charge-stability diagrams as a figure of merit* Implement computer-aided qubit calibration on the full device to obtain target fidelities* Use simultaneous randomized benchmarking to measure the crosstalk and employ strategies developed for intermediate-scale system to minimize it
a. Creation of a digital pan-European course on development and applications of germanium quantum technologies for professionals - (TUD, UCPH, IST, QDEVIL, POLIMI, IMEC, all)b. Facilitate the promotion of the training efforts by collaborating with European projects involved in quantum technology education and training, such as QTEdu CSA - (TUD)
Germanium workshop and conference (öffnet in neuem Fenster)Also in month 30.Coordinating the organization of the Germanium Day in Austria (IST) and 'The germanium quantum information route' conference (UKON) together with all IGNITE WPs, an event to showcase the milestones and achievements of IGNITE - (UKON, IST, all)
Creation of IGNITE website: central platform for communication
Elaboration of an efficient Data Management Plan
Veröffentlichungen
Autoren:
Floor van Riggelen-Doelman, Chien-An Wang, Sander L. de Snoo, William I. L. Lawrie, Nico W. Hendrickx, Maximilian Rimbach-Russ, Amir Sammak, Giordano Scappucci, Corentin Déprez, Menno Veldhorst
Veröffentlicht in:
Nature Communications, Ausgabe 15, 2024, ISSN 2041-1723
Herausgeber:
Springer Science and Business Media LLC
DOI:
10.1038/S41467-024-49358-Y
Autoren:
Valentina Gualtieri; Charles Renshaw-Whitman; Vinicius Hernandes; Eliska Greplova
Veröffentlicht in:
SciPost Physics Codebases, Ausgabe 46-r1.1, 2025, ISSN 2949-804X
Herausgeber:
SciPost Foundation
DOI:
10.21468/SCIPOSTPHYSCODEB.46-R1.1
Autoren:
Yaser Hajati; Irina Heinz; Guido Burkard
Veröffentlicht in:
Physical Review Research, Ausgabe 2, 2025, ISSN 2643-1564
Herausgeber:
American Physical Society
DOI:
10.48550/ARXIV.2501.16464
Autoren:
Shimura, Yosuke; Godfrin, Clement; Hikavyy, Andriy; Li, Roy; Aguilera, Juan; Katsaros, Georgios; Favia, Paola; Han, Han; Wan, Danny; De Greve, Kristiaan; Loo, Roger
Veröffentlicht in:
Materials Science in Semiconductor Processing, Ausgabe 108231, 2024, ISSN 1369-8001
Herausgeber:
Pergamon Press
DOI:
10.1016/J.MSSP.2024.108231
Autoren:
Baksa Kolok and András Pályi
Veröffentlicht in:
Physical Review B, Ausgabe 109, 2024, ISSN 2469-9969
Herausgeber:
Purpose -led Publishing
DOI:
10.1103/PhysRevB.109.045438
Autoren:
https://doi.org/10.1103/PhysRevB.106.155412
Veröffentlicht in:
Physical Review B, Ausgabe 106, 2022, ISSN 2469-9969
Herausgeber:
Purpose-Led Publishing
DOI:
10.1103/PhysRevB.106.155412
Autoren:
György, Chien-An Wang, Gábor Széchenyi, Floor van Riggelen-Doelman, William I. L. Lawrie, Nico W. Hendrickx, Amir Sammak, Giordano Scappucci, András Pályi, and Menno Veldhorst.
Veröffentlicht in:
Physical Review Letters, Ausgabe 132, 2024, ISSN 1079-7114
Herausgeber:
American Physical Society
DOI:
10.1103/PHYSREVLETT.132.067001
Autoren:
Yosuke Shimura; Clement Godfrin; Andriy Hikavyy; Roy Li; Juan Aguilera; Georgios Katsaros; Paola Favia; Han Han; Danny Wan; Kristiaan De Greve; Roger Loo
Veröffentlicht in:
ScienceDirect, Ausgabe Volume 174, 108231, 2024, ISSN 1873-4081
Herausgeber:
Elsevier
DOI:
10.1016/j.mssp.2024.108231
Autoren:
Lazar Lakic; William I. L. Lawrie; David van Driel; Lucas E. A. Stehouwer; Yao Su; Menno Veldhorst; Giordano Scappucci; Ferdinand Kuemmeth; Anasua Chatterjee
Veröffentlicht in:
Nature Materials, Ausgabe 24, 2025, ISSN 1476-4660
Herausgeber:
Nature Materials
DOI:
10.48550/ARXIV.2405.02013
Autoren:
György, Zoltán; Pályi, András; Széchenyi, Gábor
Veröffentlicht in:
Physical Review B, Ausgabe 106, 2022, ISSN 2469-9969
Herausgeber:
American Physical Society
DOI:
10.48550/ARXIV.2206.00399
Autoren:
Yaser Hajati; Guido Burkard
Veröffentlicht in:
Physical Review B, Ausgabe 110, 2024, ISSN 2469-9969
Herausgeber:
American Physical Society
DOI:
10.1103/PHYSREVB.110.245301
Autoren:
Chien-An Wang; Valentin John; Hanifa Tidjani; Cécile X. Yu; Alexander S. Ivlev; Corentin Déprez; Floor van Riggelen-Doelman; Benjamin D. Woods; Nico W. Hendrickx; William I. L. Lawrie; Lucas E. A. Stehouwer; Stefan D. Oosterhout; Amir Sammak; Mark Friesen; Giordano Scappucci; Sander L. de Snoo; Maximilian Rimbach-Russ; Francesco Borsoi; Menno Veldhorst
Veröffentlicht in:
Science, Ausgabe 6707, 2024, ISSN 0036-8075
Herausgeber:
American Association for the Advancement of Science
DOI:
10.48550/ARXIV.2402.18382
Autoren:
Kolok, Baksa; Pályi, András
Veröffentlicht in:
Physical Review B, Ausgabe 109, 2024, ISSN 2469-9969
Herausgeber:
American Physical Society
DOI:
10.48550/ARXIV.2308.05455
Autoren:
Valentina Gualtieri; Charles Renshaw-Whitman; Vinicius Hernandes; Eliska Greplova
Veröffentlicht in:
SciPost Physics Codebases, Ausgabe 46, 2025, ISSN 2949-804X
Herausgeber:
SciPost Foundation
DOI:
10.48550/ARXIV.2404.02712
Autoren:
Anantha S. Rao; Donovan Buterakos; Barnaby van Straaten; Valentin John; Cécile X. Yu; Stefan D. Oosterhout; Lucas Stehouwer; Giordano Scappucci; Menno Veldhorst; Francesco Borsoi; Justyna P. Zwolak
Veröffentlicht in:
Physical Review X, Ausgabe 15, 2025, ISSN 2160-3308
Herausgeber:
American Physical Society
DOI:
10.48550/ARXIV.2411.12516
Autoren:
Anton Zubchenko; Danielle Middlebrooks; Torbjørn Rasmussen; Lara Lausen; Ferdinand Kuemmeth; Anasua Chatterjee; Justyna P. Zwolak
Veröffentlicht in:
Physical Review Applied, Ausgabe 014072, 2025, ISSN 2331-7019
Herausgeber:
American Physical Society
DOI:
10.48550/ARXIV.2407.20061
Autoren:
Lucas E. A. Stehouwer, Merrit P. Losert, Maia Rigot, Davide Degli Esposti, Sara Martí-Sánchez, Maximillian Rimbach-Russ, Jordi Arbiol, Mark Friesen, Giordano Scappucci
Veröffentlicht in:
Nano Letters, Ausgabe 25, 2025, ISSN 1530-6984
Herausgeber:
American Chemical Society (ACS)
DOI:
10.1021/ACS.NANOLETT.5C02848
Autoren:
Lucas E. A. Stehouwer; Cécile X. Yu; Barnaby van Straaten; Alberto Tosato; Valentin John; Davide Degli Esposti; Asser Elsayed; Davide Costa; Stefan D. Oosterhout; Nico W. Hendrickx; Menno Veldhorst; Francesco Borsoi; Giordano Scappucci
Veröffentlicht in:
Nature Materials, Ausgabe 24, 2025, ISSN 1476-4660
Herausgeber:
Nature Materials
DOI:
10.1038/S41563-025-02276-W
Autoren:
Valentin John, Francesco Borsoi, Nico W. Hendrickx, Giordano Scappucci, András Pályi, and Menno Veldhorst.
Veröffentlicht in:
PHYSICAL REVIEW B, Ausgabe 108, 2023, ISSN 2469-9950
Herausgeber:
American Physical Society
DOI:
10.1103/PHYSREVB.108.245406
Autoren:
Menno Veldhorst, Andreas Pijpker, Francesco Borsoi, Zoltán György, D. Lane Smith, William I. L. Lawrie, Matteo Biondi, Nikolai A. Ziko, Amir Sammak, Giordano Scappucci
Veröffentlicht in:
Nature Communications, Ausgabe 169, 2024, ISSN 2041-1723
Herausgeber:
Nature Publishing Group
DOI:
10.1038/S41467-023-44114-0
Autoren:
Alberto Tosato, Asser Elsayed, Federico Poggiali, Lucas Erik Adriaan Stehouwer, Davide Costa, Karina Louise Hudson, Davide Degli Esposti, Giordano Scappucci
Veröffentlicht in:
Nature Electronics, 2026, ISSN 2520-1131
Herausgeber:
Springer Science and Business Media LLC
DOI:
10.1038/S41928-026-01569-5
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