Coherent spin manipulation in an exchange-only qubit
Edward A. Laird,Jacob M. Taylor,David P. DiVincenzo,Charles Marcus,Micah Hanson,A. C. Gossard +5 more
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TLDR
The three-spin qubit was designed to allow all operations for full qubit control to be tuned via nearest-neighbor exchange interaction as discussed by the authors, and the theory of the exchange-only qubit is developed and it is shown that initialization of only two spins suffices for operation.Abstract:
Initialization, two-spin coherent manipulation, and readout of a three-spin qubit are demonstrated using a few-electron triple quantum dot. The three-spin qubit is designed to allow all operations for full qubit control to be tuned via nearest-neighbor exchange interaction. Fast readout of charge states takes advantage of multiplexed reflectometry. Decoherence measured in a two-spin subspace is found to be consistent with predictions based on gate voltage noise with a uniform power spectrum. The theory of the exchange-only qubit is developed and it is shown that initialization of only two spins suffices for operation. Requirements for full multiqubit control using only exchange and electrostatic interactions are outlined.read more
Citations
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Journal ArticleDOI
Interfacing spin qubits in quantum dots and donors—hot, dense, and coherent
Lieven M. K. Vandersypen,Lieven M. K. Vandersypen,Hendrik Bluhm,James S. Clarke,Andrew S. Dzurak,Ryoichi Ishihara,Andrea Morello,David J. Reilly,Lars R. Schreiber,Menno Veldhorst +9 more
TL;DR: In this article, the authors review several strategies that are considered to address this crucial challenge in scaling quantum circuits based on electron spin qubits. But, the wiring and interconnect requirements for quantum circuits are completely different from those for classical circuits, as individual direct current, pulsed and in some cases microwave control signals need to be routed from external sources to every qubit.
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Prospects for Spin-Based Quantum Computing in Quantum Dots
Christoph Kloeffel,Daniel Loss +1 more
TL;DR: Experimental and theoretical progress toward quantum computation with spins in quantum dots (QDs) is reviewed, with particular focus on QDs formed in GaAs heterostructures, on nanowire-based QDs, and on self-assembled QDs.
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Charge Noise Spectroscopy Using Coherent Exchange Oscillations in a Singlet-Triplet Qubit
TL;DR: Measurements of the level splitting and dephasing due to the voltage noise of a GaAs singlet-triplet qubit during exchange oscillations are shown, finding that the voltage fluctuations are non-Markovian even at high frequencies and exhibit a strong temperature dependence.
Journal ArticleDOI
Quantum control and process tomography of a semiconductor quantum dot hybrid qubit
Dohun Kim,Zhan Shi,Christie Simmons,D. R. Ward,Jonathan Prance,Teck Seng Koh,John King Gamble,Donald E. Savage,Max G. Lagally,Mark Friesen,Susan Coppersmith,Mark A. Eriksson +11 more
TL;DR: This work demonstrates a qubit that is a hybrid of spin and charge, requiring neither nuclear-state preparation nor micromagnets, and enables fast rotations about two axes of the Bloch sphere.
Journal ArticleDOI
Self-consistent measurement and state tomography of an exchange-only spin qubit
James Medford,Johannes Beil,Johannes Beil,Jacob M. Taylor,Stephen D. Bartlett,Andrew C. Doherty,Emmanuel I. Rashba,David P. DiVincenzo,David P. DiVincenzo,Hong Lu,Arthur C. Gossard,Charles Marcus,Charles Marcus +12 more
TL;DR: Initiation, full control, and single-shot readout of a three-electron exchange-driven spin qubit is reported, allowing decoherence, leakage out of the qubit state space, and measurement fidelity to be quantified.
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