Ludwik Kranz
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View article: An 11-qubit atom processor in silicon
An 11-qubit atom processor in silicon Open
Phosphorus atoms in silicon are an outstanding platform for quantum computing as their nuclear spins exhibit coherence time over seconds. By placing multiple phosphorus atoms within a radius of a few nanometers, they couple via the hyperfi…
View article: An 11-qubit atom processor in silicon
An 11-qubit atom processor in silicon Open
Phosphorus atoms in silicon are an outstanding platform for quantum computing as their nuclear spins exhibit coherence time over seconds [1, 2]. By placing multiple phosphorus atoms within a radius of a few nanometers, they couple via the …
View article: High-fidelity sub-microsecond single-shot electron spin readout above 3.5 K
High-fidelity sub-microsecond single-shot electron spin readout above 3.5 K Open
View article: Grover’s algorithm in a four-qubit silicon processor above the fault-tolerant threshold
Grover’s algorithm in a four-qubit silicon processor above the fault-tolerant threshold Open
Spin qubits in silicon are strong contenders for the realization of a practical quantum computer, having demonstrated single- and two-qubit gates with fidelities above the fault-tolerant threshold, and entanglement of three qubits. However…
View article: Machine Learning-Assisted Precision Manufacturing of Atom Qubits in Silicon
Machine Learning-Assisted Precision Manufacturing of Atom Qubits in Silicon Open
Donor-based qubits in silicon, manufactured using scanning tunneling microscope (STM) lithography, provide a promising route to realizing full-scale quantum computing architectures. This is due to the precision of donor placement, long coh…
View article: Noise Correlations in a 1D Silicon Spin Qubit Array
Noise Correlations in a 1D Silicon Spin Qubit Array Open
Correlated noise across multi-qubit architectures is known to be highly detrimental to the operation of error correcting codes and the long-term feasibility of quantum processors. The recent discovery of spatially dependent correlated nois…
View article: Grover's algorithm in a four-qubit silicon processor above the fault-tolerant threshold
Grover's algorithm in a four-qubit silicon processor above the fault-tolerant threshold Open
Spin qubits in silicon are strong contenders for realizing a practical quantum computer. This technology has made remarkable progress with the demonstration of single and two-qubit gates above the fault-tolerant threshold and entanglement …
View article: High-fidelity initialization and control of electron and nuclear spins in a four-qubit register
High-fidelity initialization and control of electron and nuclear spins in a four-qubit register Open
View article: Impact of measurement backaction on nuclear spin qubits in silicon
Impact of measurement backaction on nuclear spin qubits in silicon Open
Phosphorus donor nuclear spins in silicon couple weakly to the environment making them promising candidates for high-fidelity qubits. The state of a donor nuclear spin qubit can be manipulated and read out using its hyperfine interaction w…
View article: Hyperfine-mediated spin relaxation in donor-atom qubits in silicon
Hyperfine-mediated spin relaxation in donor-atom qubits in silicon Open
Donor electron spin qubits hosted within nanoscale devices have demonstrated seconds-long relaxation times at magnetic fields suitable for the operation of spin qubits in silicon of B=1.5T. The relaxation rates of these qubits have been sh…
View article: High-Fidelity CNOT Gate for Donor Electron Spin Qubits in Silicon
High-Fidelity CNOT Gate for Donor Electron Spin Qubits in Silicon Open
Epitaxial atom-based spin qubits in silicon exhibit excellent properties, and benefit from the outstanding scalability of that material platform. As silicon spin-based qubits now start to meet the 99% fault-tolerance threshold, the authors…
View article: The Use of Exchange Coupled Atom Qubits as Atomic‐Scale Magnetic Field Sensors (Adv. Mater. 6/2023)
The Use of Exchange Coupled Atom Qubits as Atomic‐Scale Magnetic Field Sensors (Adv. Mater. 6/2023) Open
Inter-Qubit Coupling Due to their atomic nature, qubits based on electrons bound to phosphorus-doped silicon quantum dots have demonstrated strong inter-qubit coupling. In article number 2201625, Ludwik Kranz, Michelle Y. Simmons, and co-w…
View article: The Use of Exchange Coupled Atom Qubits as Atomic‐Scale Magnetic Field Sensors
The Use of Exchange Coupled Atom Qubits as Atomic‐Scale Magnetic Field Sensors Open
Phosphorus atoms in silicon offer a rich quantum computing platform where both nuclear and electron spins can be used to store and process quantum information. While individual control of electron and nuclear spins has been demonstrated, t…
View article: Ramped measurement technique for robust high-fidelity spin qubit readout
Ramped measurement technique for robust high-fidelity spin qubit readout Open
State preparation and measurement of single-electron spin qubits typically rely on spin-to-charge conversion where a spin-dependent charge transition of the electron is detected by a coupled charge sensor. For high-fidelity, fast readout, …
View article: Impact of charge noise on electron exchange interactions in semiconductors
Impact of charge noise on electron exchange interactions in semiconductors Open
The electron exchange interaction is a promising medium for the entanglement of single-spin qubits in semiconductors as it results in high-speed two-qubit gates. The quality of such entangling gates is reduced by the presence of noise caus…
View article: Coherent control of a donor-molecule electron spin qubit in silicon
Coherent control of a donor-molecule electron spin qubit in silicon Open
Donor spins in silicon provide a promising material platform for large scale quantum computing. Excellent electron spin coherence times of $${T}_{2}^{* }=268$$ μ s with fidelities of 99.9% have been demonstrated for isolated phos…
View article: Quantum Computing: Exploiting a Single‐Crystal Environment to Minimize the Charge Noise on Qubits in Silicon (Adv. Mater. 40/2020)
Quantum Computing: Exploiting a Single‐Crystal Environment to Minimize the Charge Noise on Qubits in Silicon (Adv. Mater. 40/2020) Open
Atom qubits in silicon provide a promising platform for realising a scalable quantum computer. In article number 2003361, Michelle Simmons and co-workers present a qubit environment with a notably low level of charge noise achieved by host…
View article: Exploiting a Single‐Crystal Environment to Minimize the Charge Noise on Qubits in Silicon
Exploiting a Single‐Crystal Environment to Minimize the Charge Noise on Qubits in Silicon Open
Electron spins in silicon offer a competitive, scalable quantum‐computing platform with excellent single‐qubit properties. However, the two‐qubit gate fidelities achieved so far have fallen short of the 99% threshold required for large‐sca…
View article: A two-qubit gate between phosphorus donor electrons in silicon
A two-qubit gate between phosphorus donor electrons in silicon Open
View article: Benchmarking high fidelity single-shot readout of semiconductor qubits
Benchmarking high fidelity single-shot readout of semiconductor qubits Open
Determination of qubit initialisation and measurement fidelity is important for the overall performance of a quantum computer. However, the method by which it is calculated in semiconductor qubits varies between experiments. In this paper …