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Electron readout contrast enhancement in the parallel nuclear regime of an exchange-coupled donor spin qubit system
Holly G. Stemp, Mark R. van Blankenstein, Benjamin Wilhelm +10
Recent experiments on donor-based spin qubits in silicon have leveraged the exchange interaction between electrons bound to separate donor nuclei to perform two-qubit operations. A…
Scalable entanglement of nuclear spins mediated by electron exchange
Holly G. Stemp, Mark R. van Blankenstein, Serwan Asaad +11
The use of nuclear spins for quantum computation is limited by the difficulty in creating genuine quantum entanglement between distant nuclei. Current demonstrations of nuclear ent…
Roadmap on Atomic-scale Semiconductor Devices
Steven R. Schofield, Andrew J. Fisher, Eran Ginossar +47
Spin states in semiconductors provide exceptionally stable and noise-resistant environments for qubits, positioning them as optimal candidates for reliable quantum computing techno…
Tomography of entangling two-qubit logic operations in exchange-coupled donor electron spin qubits
Holly G. Stemp, Serwan Asaad, Mark R. van Blankenstein +19
Scalable quantum processors require high-fidelity universal quantum logic operations in a manufacturable physical platform. Donors in silicon provide atomic size, excellent quantum…
High-fidelity operation and algorithmic initialisation of spin qubits above one kelvin
Jonathan Y. Huang, Rocky Y. Su, Wee Han Lim +23
The encoding of qubits in semiconductor spin carriers has been recognised as a promising approach to a commercial quantum computer that can be lithographically produced and integra…
Error channels in quantum nondemolition measurements on spin systems
Benjamin Joecker, Holly G. Stemp, Irene Fernández de Fuentes +2
Quantum nondemolition (QND) measurements are a precious resource for quantum information processing. Repetitive QND measurements can boost the fidelity of qubit preparation and mea…
Navigating the 16-dimensional Hilbert space of a high-spin donor qudit with electric and magnetic fields
Irene Fernández de Fuentes, Tim Botzem, Mark A. I. Johnson +11
Efficient scaling and flexible control are key aspects of useful quantum computing hardware. Spins in semiconductors combine quantum information processing with electrons, holes or…
Single-Step Parity Check Gate Set for Quantum Error Correction
Gözde Üstün, Andrea Morello, Simon Devitt
A key requirement for an effective Quantum Error Correction (QEC) scheme is that the physical qubits have error rates below a certain threshold. The value of this threshold depends…
Robust Macroscopic Schrödinger's Cat on a Nucleus
Pragati Gupta, Arjen Vaartjes, Xi Yu +2
We propose a scheme to generate spin cat states, i.e., superpositions of maximally separated quasiclassical states on a single high-dimensional nuclear spin in a solid-state device…
Assessment of error variation in high-fidelity two-qubit gates in silicon
Tuomo Tanttu, Wee Han Lim, Jonathan Y. Huang +24
Achieving high-fidelity entangling operations between qubits consistently is essential for the performance of multi-qubit systems and is a crucial factor in achieving fault-toleran…
In-situ amplification of spin echoes within a kinetic inductance parametric amplifier
Wyatt Vine, Mykhailo Savytskyi, Daniel Parker +6
The use of superconducting micro-resonators in combination with quantum-limited Josephson parametric amplifiers has in recent years lead to more than four orders of magnitude impro…
An electrically-driven single-atom `flip-flop' qubit
Rostyslav Savytskyy, Tim Botzem, Irene Fernandez de Fuentes +9
The spins of atoms and atom-like systems are among the most coherent objects in which to store quantum information. However, the need to address them using oscillating magnetic fie…
Beating the thermal limit of qubit initialization with a Bayesian Maxwell's demon
Mark A. I. Johnson, Mateusz T. Mądzik, Fay E. Hudson +5
Fault-tolerant quantum computing requires initializing the quantum register in a well-defined fiducial state. In solid-state systems, this is typically achieved through thermalizat…
A near-ideal degenerate parametric amplifier
Daniel J. Parker, Mykhailo Savytskyi, Wyatt Vine +5
Degenerate parametric amplifiers (DPAs) exhibit the unique property of phase-sensitive gain and can be used to noiselessly amplify small signals or squeeze field fluctuations benea…
Precision tomography of a three-qubit donor quantum processor in silicon
Mateusz T. Mądzik, Serwan Asaad, Akram Youssry +17
Nuclear spins were among the first physical platforms to be considered for quantum information processing, because of their exceptional quantum coherence and atomic-scale footprint…
Fast coherent control of an NV- spin ensemble using a KTaO3 dielectric resonator at cryogenic temperatures
Hyma H. Vallabhapurapu, James P. Slack-Smith, Vikas K. Sewani +4
Microwave delivery to samples in a cryogenic environment can pose experimental challenges such as restricting optical access, space constraints and heat generation. Moreover, exist…
Donor spins in silicon for quantum technologies
Andrea Morello, Jarryd J. Pla, Patrice Bertet +1
Dopant atoms are ubiquitous in semiconductor technologies, providing the tailored electronic properties that underpin the modern digital information era. Harnessing the quantum nat…
Exchange coupling in a linear chain of three quantum-dot spin qubits in silicon
Kok Wai Chan, Harshad Sahasrabudhe, Wister Huang +12
Quantum gates between spin qubits can be implemented leveraging the natural Heisenberg exchange interaction between two electrons in contact with each other. This interaction is co…
Pauli Blockade in Silicon Quantum Dots with Spin-Orbit Control
Amanda Seedhouse, Tuomo Tanttu, Ross C. C. Leon +12
Quantum computation relies on accurate measurements of qubits not only for reading the output of the calculation, but also to perform error correction. Most proposed scalable silic…
Measuring out-of-time-ordered correlation functions without reversing time evolution
Philip Daniel Blocher, Serwan Asaad, Vincent Mourik +3
Out-of-time-ordered correlation functions (OTOCs) play a crucial role in the study of thermalization, entanglement, and quantum chaos, as they quantify the scrambling of quantum in…
A silicon quantum-dot-coupled nuclear spin qubit
Bas Hensen, Wister Wei Huang, Chih-Hwan Yang +9
Single nuclear spins in the solid state have long been envisaged as a platform for quantum computing, due to their long coherence times and excellent controllability. Measurements…
Gate-based single-shot readout of spins in silicon
A. West, B. Hensen, A. Jouan +8
Electron spins in silicon quantum dots provide a promising route towards realising the large number of coupled qubits required for a useful quantum processor. At present, the requi…
Assessment of a silicon quantum dot spin qubit environment via noise spectroscopy
K. W. Chan, W. Huang, C. H. Yang +8
Preserving coherence long enough to perform meaningful calculations is one of the major challenges on the pathway to large scale quantum computer implementations. Noise coupled fro…
Integrated silicon qubit platform with single-spin addressability, exchange control and robust single-shot singlet-triplet readout
M. A. Fogarty, K. W. Chan, B. Hensen +10
Silicon quantum dot spin qubits provide a promising platform for large-scale quantum computation because of their compatibility with conventional CMOS manufacturing and the long co…