Quantum control of electron and nuclear spin qubits in the solid-state

2006 ◽  
Author(s):  
M. V. Gurudev Dutt ◽  
L. Childress ◽  
E. Togan ◽  
J. M. Taylor ◽  
L. Jiang ◽  
...  
Keyword(s):  
Solid State ◽  
Nuclear Spin ◽  
Quantum Control ◽  
Spin Qubits

scholarly journals Vanadium spin qubits as telecom quantum emitters in silicon carbide

2020 ◽  
Vol 6 (18) ◽  
pp. eaaz1192 ◽  
Author(s):  
Gary Wolfowicz ◽  
Christopher P. Anderson ◽  
Berk Diler ◽  
Oleg G. Poluektov ◽  
F. Joseph Heremans ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Solid State ◽  
Nuclear Spin ◽  
Quantum Control ◽  
Hyperfine Interactions ◽  
Low Loss ◽  
Near Surface ◽  
Optically Detected ◽  
Mass Shifts ◽  
Quantum Emitters

Solid-state quantum emitters with spin registers are promising platforms for quantum communication, yet few emit in the narrow telecom band necessary for low-loss fiber networks. Here, we create and isolate near-surface single vanadium dopants in silicon carbide (SiC) with stable and narrow emission in the O band, with brightness allowing cavity-free detection in a wafer-scale material. In vanadium ensembles, we characterize the complex d1 orbital physics in all five available sites in 4H-SiC and 6H-SiC. The optical transitions are sensitive to mass shifts from local silicon and carbon isotopes, enabling optically resolved nuclear spin registers. Optically detected magnetic resonance in the ground and excited orbital states reveals a variety of hyperfine interactions with the vanadium nuclear spin and clock transitions for quantum memories. Last, we demonstrate coherent quantum control of the spin state. These results provide a path for telecom emitters in the solid state for quantum applications.

scholarly journals Quantum control of nuclear-spin qubits in a rapidly rotating diamond

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
A. A. Wood ◽  
R. M. Goldblatt ◽  
R. E. Scholten ◽  
A. M. Martin
Keyword(s):  
Nuclear Spin ◽  
Quantum Control ◽  
Spin Qubits

scholarly journals Fundamental limits of electron and nuclear spin qubit lifetimes in an isolated self-assembled quantum dot

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
George Gillard ◽  
Ian M. Griffiths ◽  
Gautham Ragunathan ◽  
Ata Ulhaq ◽  
Callum McEwan ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Spin Relaxation ◽  
Nuclear Spin ◽  
Operating Conditions ◽  
External Control ◽  
Spin Qubits ◽  
Fundamental Limits ◽  
Trade Offs ◽  
Wide Range ◽  
Spin Qubit

AbstractCombining external control with long spin lifetime and coherence is a key challenge for solid state spin qubits. Tunnel coupling with electron Fermi reservoir provides robust charge state control in semiconductor quantum dots, but results in undesired relaxation of electron and nuclear spins through mechanisms that lack complete understanding. Here, we unravel the contributions of tunnelling-assisted and phonon-assisted spin relaxation mechanisms by systematically adjusting the tunnelling coupling in a wide range, including the limit of an isolated quantum dot. These experiments reveal fundamental limits and trade-offs of quantum dot spin dynamics: while reduced tunnelling can be used to achieve electron spin qubit lifetimes exceeding 1 s, the optical spin initialisation fidelity is reduced below 80%, limited by Auger recombination. Comprehensive understanding of electron-nuclear spin relaxation attained here provides a roadmap for design of the optimal operating conditions in quantum dot spin qubits.

scholarly journals Environment-assisted quantum control of a solid-state spin via coherent dark states

2014 ◽  
Vol 10 (10) ◽  
pp. 725-730 ◽  
Author(s):  
Jack Hansom ◽  
Carsten H. H. Schulte ◽  
Claire Le Gall ◽  
Clemens Matthiesen ◽  
Edmund Clarke ◽  
...  
Keyword(s):  
Solid State ◽  
Quantum Control ◽  
State Spin

Dynamics of nuclear spin measurement in a mesoscopic solid-state quantum computer

2000 ◽  
Vol 12 (13) ◽  
pp. 2945-2952 ◽  
Author(s):  
Gennady P Berman ◽  
David K Campbell ◽  
Gary D Doolen ◽  
Kirill E Nagaev
Keyword(s):  
Solid State ◽  
Nuclear Spin ◽  
Quantum Computer

SILICON-BASED NUCLEAR SPIN QUANTUM COMPUTER

2005 ◽  
Vol 03 (supp01) ◽  
pp. 27-40 ◽  
Author(s):  
HSI-SHENG GOAN
Keyword(s):  
Solid State ◽  
Nuclear Spin ◽  
Quantum Computer ◽  
Theoretical Progress ◽  
Spin Quantum ◽  
Basic Physics ◽  
Qubit Operations ◽  
Silicon Based

We review the basic physics and operation principles of the silicon-based quantum computer proposed by Kane, one of the most promising solid-state quantum computer proposals. We describe in some details how single- and two-qubit operations and readout measurements can, in principle, be performed for the Kane quantum computer. In addition, we also mention briefly its recent theoretical progress and development.

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