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Improved placement precision of implanted donor spin qubits in silicon using molecule ions
Danielle Holmes, Benjamin Wilhelm, Alexander M. Jakob +6
Donor spins in silicon-28 (Si) are among the most performant qubits in the solid state, offering record coherence times and gate fidelities above 99%. Donor spin qubits can…
Jellybean quantum dots in silicon for qubit coupling and on-chip quantum chemistry
Zeheng Wang, MengKe Feng, Santiago Serrano +15
The small size and excellent integrability of silicon metal-oxide-semiconductor (SiMOS) quantum dot spin qubits make them an attractive system for mass-manufacturable, scaled-up qu…
Quantum-Coherent Nanoscience
Andreas J. Heinrich, William D. Oliver, Lieven Vandersypen +7
For the past three decades, nanoscience has widely affected many areas in physics, chemistry, and engineering, and has led to numerous fundamental discoveries as well as applicatio…
Near-Surface Electrical Characterisation of Silicon Electronic Devices Using Focused keV Ions
Simon G. Robson, Paul Räcke, Alexander M. Jakob +8
The demonstration of universal quantum logic operations near the fault-tolerance threshold establishes ion-implanted near-surface donor atoms as a plausible platform for scalable q…
On-demand electrical control of spin qubits
Will Gilbert, Tuomo Tanttu, Wee Han Lim +17
Once called a "classically non-describable two-valuedness" by Pauli , the electron spin is a natural resource for long-lived quantum information since it is mostly impervious to el…
Engineering local strain for single-atom nuclear acoustic resonance in silicon
Laura A. O'Neill, Benjamin Joecker, Andrew D. Baczewski +1
Mechanical strain plays a key role in the physics and operation of nanoscale semiconductor systems, including quantum dots and single-dopant devices. Here we describe the design of…
Full configuration interaction simulations of exchange-coupled donors in silicon using multi-valley effective mass theory
Benjamin Joecker, Andrew D. Baczewski, John K. Gamble +3
Donor spin in silicon have achieved record values of coherence times and single-qubit gate fidelities. The next stage of development involves demonstrating high-fidelity two-qubit…
Deterministic Single Ion Implantation with 99.87% Confidence for Scalable Donor-Qubit Arrays in Silicon
Alexander M. Jakob, Simon G. Robson, Vivien Schmitt +9
The attributes of group-V-donor spins implanted in an isotopically purified Si crystal make them attractive qubits for large-scale quantum computer devices. Important featur…
Coherent spin qubit transport in silicon
J. Yoneda, W. Huang, M. Feng +12
A fault-tolerant quantum processor may be configured using stationary qubits interacting only with their nearest neighbours, but at the cost of significant overheads in physical qu…
Spin thermometry and spin relaxation of optically detected Cr3+ ions in ruby Al2O3
Vikas K. Sewani, Rainer J. Stöhr, Roman Kolesov +4
Paramagnetic ions in solid state crystals form the basis for many advanced technologies such as lasers, masers, frequency standards, and quantum-enhanced sensors. One of the most-s…
Conditional quantum operation of two exchange-coupled single-donor spin qubits in a MOS-compatible silicon device
Mateusz T. Mądzik, Arne Laucht, Fay E. Hudson +6
Silicon nanoelectronic devices can host single-qubit quantum logic operations with fidelity better than 99.9%. For the spins of an electron bound to a single donor atom, introduced…
Semiconductor Qubits In Practice
Anasua Chatterjee, Paul Stevenson, Silvano De Franceschi +3
In recent years semiconducting qubits have undergone a remarkable evolution, making great strides in overcoming decoherence as well as in prospects for scalability, and have become…
Controllable freezing of the nuclear spin bath in a single-atom spin qubit
Mateusz T. Mądzik, Thaddeus D. Ladd, Fay E. Hudson +8
The quantum coherence and gate fidelity of electron spin qubits in semiconductors is often limited by noise arising from coupling to a bath of nuclear spins. Isotopic enrichment of…
Coherent electrical control of a single high-spin nucleus in silicon
Serwan Asaad, Vincent Mourik, Benjamin Joecker +12
Nuclear spins are highly coherent quantum objects. In large ensembles, their control and detection via magnetic resonance is widely exploited, e.g. in chemistry, medicine, material…
Silicon quantum processor unit cell operation above one Kelvin
C. H. Yang, R. C. C. Leon, J. C. C. Hwang +12
Quantum computers are expected to outperform conventional computers for a range of important problems, from molecular simulation to search algorithms, once they can be scaled up to…
Coherent spin control of s-, p-, d- and f-electrons in a silicon quantum dot
R. C. C. Leon, C. H. Yang, J. C. C. Hwang +12
Once the periodic properties of elements were unveiled, chemical bonds could be understood in terms of the valence of atoms. Ideally, this rationale would extend to quantum dots, o…
Single-spin qubits in isotopically enriched silicon at low magnetic field
R. Zhao, T. Tanttu, K. Y. Tan +13
Single-electron spin qubits employ magnetic fields on the order of 1 Tesla or above to enable quantum state readout via spin-dependent-tunnelling. This requires demanding microwave…
Electron spin relaxation of single phosphorus donors in metal-oxide-semiconductor nanoscale devices
Stefanie B. Tenberg, Serwan Asaad, Mateusz T. Mądzik +12
We analyze the electron spin relaxation rate of individual ion-implanted P donors, in a large set of metal-oxide-semiconductor (MOS) silicon nanoscale devices, with…
Controlling spin-orbit interactions in silicon quantum dots using magnetic field direction
Tuomo Tanttu, Bas Hensen, Kok Wai Chan +9
Silicon quantum dots are considered an excellent platform for spin qubits, partly due to their weak spin-orbit interaction. However, the sharp interfaces in the heterostructures in…
Silicon qubit fidelities approaching incoherent noise limits via pulse engineering
C. H. Yang, K. W. Chan, R. Harper +12
The performance requirements for fault-tolerant quantum computing are very stringent. Qubits must be manipulated, coupled, and measured with error rates well below 1%. For semicond…
Fidelity benchmarks for two-qubit gates in silicon
W. Huang, C. H. Yang, K. W. Chan +10
Universal quantum computation will require qubit technology based on a scalable platform, together with quantum error correction protocols that place strict limits on the maximum i…
Robust electric dipole transition at microwave frequencies for nuclear spin qubits in silicon
Guilherme Tosi, Fahd A. Mohiyaddin, Stefanie Tenberg +2
The nuclear spin state of a phosphorus donor (P) in isotopically enriched silicon-28 is an excellent host to store quantum information in the solid state. The spin's insensi…
Interfacing spin qubits in quantum dots and donors - hot, dense and coherent
L. M. K. Vandersypen, H. Bluhm, J. S. Clarke +6
Semiconductor spins are one of the few qubit realizations that remain a serious candidate for the implementation of large-scale quantum circuits. Excellent scalability is often arg…
Optimization of a solid-state electron spin qubit using Gate Set Tomography
Juan P. Dehollain, Juha T. Muhonen, Robin Blume-Kohout +8
State of the art qubit systems are reaching the gate fidelities required for scalable quantum computation architectures. Further improvements in the fidelity of quantum gates deman…