Scalable gate architecture for densely packed semiconductor spin qubits
TLDR
In this paper, the authors demonstrate a 12 quantum dot device fabricated on an undoped Si/SiGe heterostructure as a proof-of-concept for a scalable, linear gate architecture for semiconductor quantum dots.Abstract:
We demonstrate a 12 quantum dot device fabricated on an undoped Si/SiGe heterostructure as a proof-of-concept for a scalable, linear gate architecture for semiconductor quantum dots. The device consists of 9 quantum dots in a linear array and 3 single quantum dot charge sensors. We show reproducible single quantum dot charging and orbital energies, with standard deviations less than 20% relative to the mean across the 9 dot array. The single quantum dot charge sensors have a charge sensitivity of 8.2 x 10^{-4} e/root(Hz) and allow the investigation of real-time charge dynamics. As a demonstration of the versatility of this device, we use single-shot readout to measure a spin relaxation time T1 = 170 ms at a magnetic field B = 1 T. By reconfiguring the device, we form two capacitively coupled double quantum dots and extract a mutual charging energy of 200 microeV, which indicates that 50 GHz two-qubit gate operation speeds are feasible.read more
Citations
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Journal ArticleDOI
Resonantly driven CNOT gate for electron spins
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TL;DR: An efficient resonantly driven CNOT gate for electron spins in silicon is demonstrated and used to create an entangled quantum state called the Bell state with 78% fidelity, which enables multi-qubit algorithms in silicon.
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Strong coupling of a single electron in silicon to a microwave photon
TL;DR: In this article, the authors demonstrate strong coupling of a single electron in a silicon double quantum dot to the photonic field of a microwave cavity, as shown by the observation of vacuum Rabi splitting.
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Shuttling a single charge across a one-dimensional array of silicon quantum dots
TL;DR: Significant advances have been made towards fault-tolerant operation of silicon spin qubits, with single qubit fidelities exceeding 99.9%, several demonstrations of two-qubit gates based on exchange coupling, and the achievement of coherent single spin-photon coupling.
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Jason R. Petta,Jason R. Petta,Jason R. Petta,A. C. Johnson,A. C. Johnson,A. C. Johnson,Jacob M. Taylor,Jacob M. Taylor,Jacob M. Taylor,Edward A. Laird,Edward A. Laird,Edward A. Laird,Amir Yacoby,Amir Yacoby,Amir Yacoby,Mikhail D. Lukin,Mikhail D. Lukin,Mikhail D. Lukin,Charles Marcus,Charles Marcus,Charles Marcus,Micah Hanson,Micah Hanson,Micah Hanson,Arthur C. Gossard,Arthur C. Gossard,Arthur C. Gossard +26 more
TL;DR: It is demonstrated coherent control of a quantum two-level system based on two-electron spin states in a double quantum dot, allowing state preparation, coherent manipulation, and projective readout based on rapid electrical control of the exchange interaction.
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