scholarly journals Modulated longitudinal gates on encoded spin qubits via curvature couplings to a superconducting cavity

2021 ◽  
Vol 103 (3) ◽  
Author(s):  
Rusko Ruskov ◽  
Charles Tahan
Keyword(s):  
Spin Qubits ◽  
Superconducting Cavity

A novel method to identify and correct asymmetry of dumbbells in a multi-cell elliptical superconducting cavity

2021 ◽  
Vol 92 (2) ◽  
pp. 024702
Author(s):  
Praveen Mohania ◽  
Avinash Puntambekar ◽  
Ashish Mahawar ◽  
Adarsh Pratap Singh ◽  
Vikas Rajput ◽  
...  
Keyword(s):  
Superconducting Cavity ◽  
Novel Method

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.

2 K cryogenic system development for superconducting cavity testing of CiADS

Cryogenics ◽  
2021 ◽  
Vol 115 ◽  
pp. 103247
Author(s):  
Niu Xiao-fei ◽  
Bai Feng ◽  
Wang Xian-jin ◽  
Zhang Peng ◽  
Yang Yong-hui ◽  
...  
Keyword(s):  
System Development ◽  
Cryogenic System ◽  
Superconducting Cavity

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
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