scholarly journals Ultracoherent operation of spin qubits with superexchange coupling

2017 ◽  
Vol 96 (20) ◽  
Author(s):  
Marko J. Rančić ◽  
Guido Burkard
Keyword(s):  
Spin Qubits ◽  
Superexchange Coupling

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 Dark Bell states in tunnel-coupled spin qubits

2013 ◽  
Vol 87 (8) ◽  
Author(s):  
Rafael Sánchez ◽  
Gloria Platero
Keyword(s):  
Bell States ◽  
Spin Qubits

scholarly journals Theoretical evaluation of lanthanide binding tags as biomolecular handles for the organization of single ion magnets and spin qubits

2016 ◽  
Vol 3 (1) ◽  
pp. 61-66 ◽  
Author(s):  
Lorena E. Rosaleny ◽  
Alejandro Gaita-Ariño
Keyword(s):  
Spin Qubits ◽  
Theoretical Evaluation ◽  
Lanthanide Binding Tags

A newly developed extension to the SIMPRE program allowed the estimation of the potential of 63 polypeptide-coordinated lanthanide structures as single ion magnets and as spin qubits.

scholarly journals Controlling Spin Qubits in Quantum Dots

2004 ◽  
Vol 3 (1-5) ◽  
pp. 115-132 ◽  
Author(s):  
Hans-Andreas Engel ◽  
L. P. Kouwenhoven ◽  
Daniel Loss ◽  
C. M. Marcus
Keyword(s):  
Quantum Dots ◽  
Spin Qubits
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