A programmable two-qubit quantum processor in silicon

A programmable two-qubit quantum processor in silicon

Watson, T.F. (TU Delft QCD/Vandersypen Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft)
Philips, S.G.J. (TU Delft QCD/Vandersypen Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft)
Kawakami, E. (TU Delft QN/Quantum Transport; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft)
Ward, D. R. (University of Wisconsin-Madison)
Scarlino, P. (TU Delft QCD/Vandersypen Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft)
Veldhorst, M. (TU Delft QCD/Veldhorst Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft)
Savage, D. E. (University of Wisconsin-Madison)
Lagally, M. G. (University of Wisconsin-Madison)
Friesen, Mark (University of Wisconsin-Madison)
Coppersmith, S. N. (University of Wisconsin-Madison)
Eriksson, M.A. (TU Delft QCD/Vandersypen Lab; University of Wisconsin-Madison)
Vandersypen, L.M.K. (TU Delft QCD/Vandersypen Lab; TU Delft QN/Vandersypen Lab; TU Delft QuTech Advanced Research Centre; University of Wisconsin-Madison; Kavli institute of nanoscience Delft)

2018-03-29

Now that it is possible to achieve measurement and control fidelities for individual quantum bits (qubits) above the threshold for fault tolerance, attention is moving towards the difficult task of scaling up the number of physical qubits to the large numbers that are needed for fault-tolerant quantum computing. In this context, quantum-dot-based spin qubits could have substantial advantages over other types of qubit owing to their potential for all-electrical operation and ability to be integrated at high density onto an industrial platform. Initialization, readout and single- and two-qubit gates have been demonstrated in various quantum-dot-based qubit representations. However, as seen with small-scale demonstrations of quantum computers using other types of qubit, combining these elements leads to challenges related to qubit crosstalk, state leakage, calibration and control hardware. Here we overcome these challenges by using carefully designed control techniques to demonstrate a programmable two-qubit quantum processor in a silicon device that can perform the Deutsch-Josza algorithm and the Grover search algorithm - canonical examples of quantum algorithms that outperform their classical analogues. We characterize the entanglement in our processor by using quantum-state tomography of Bell states, measuring state fidelities of 85-89 per cent and concurrences of 73-82 per cent. These results pave the way for larger-scale quantum computers that use spins confined to quantum dots.

http://resolver.tudelft.nl/uuid:65a45465-f4be-44b8-8cc3-49bfb2cf9be9

https://doi.org/10.1038/nature25766

2018-08-14

0028-0836

Nature: international weekly journal of science, 555 (7698), 633-637

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

journal article

© 2018 T.F. Watson, S.G.J. Philips, E. Kawakami, D. R. Ward, P. Scarlino, M. Veldhorst, D. E. Savage, M. G. Lagally, Mark Friesen, S. N. Coppersmith, M.A. Eriksson, L.M.K. Vandersypen