Quantum information transfer between photonic and quantum-dot spin qubits

2016 ◽  
Vol 14 (6) ◽  
pp. 062701-62705 ◽  
Author(s):  
Ruitong Zhao Ruitong Zhao ◽  
Ruisheng Liang Ruisheng Liang
Keyword(s):  
Quantum Information ◽  
Quantum Dot ◽  
Information Transfer ◽  
Spin Qubits

scholarly journals Adiabatic quantum state transfer in a semiconductor quantum-dot spin chain

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yadav P. Kandel ◽  
Haifeng Qiao ◽  
Saeed Fallahi ◽  
Geoffrey C. Gardner ◽  
Michael J. Manfra ◽  
...  
Keyword(s):  
Quantum Computing ◽  
Quantum Dot ◽  
Quantum State ◽  
Information Transfer ◽  
Full Potential ◽  
Quantum State Transfer ◽  
Spin Qubits ◽  
Semiconductor Quantum Dot ◽  
State Transfer ◽  
Spin Singlet

AbstractSemiconductor quantum-dot spin qubits are a promising platform for quantum computation, because they are scalable and possess long coherence times. In order to realize this full potential, however, high-fidelity information transfer mechanisms are required for quantum error correction and efficient algorithms. Here, we present evidence of adiabatic quantum-state transfer in a chain of semiconductor quantum-dot electron spins. By adiabatically modifying exchange couplings, we transfer single- and two-spin states between distant electrons in less than 127 ns. We also show that this method can be cascaded for spin-state transfer in long spin chains. Based on simulations, we estimate that the probability to correctly transfer single-spin eigenstates and two-spin singlet states can exceed 0.95 for the experimental parameters studied here. In the future, state and process tomography will be required to verify the transfer of arbitrary single qubit states with a fidelity exceeding the classical bound. Adiabatic quantum-state transfer is robust to noise and pulse-timing errors. This method will be useful for initialization, state distribution, and readout in large spin-qubit arrays for gate-based quantum computing. It also opens up the possibility of universal adiabatic quantum computing in semiconductor quantum-dot 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 Protecting quantum information in quantum dot spin chains by driving exchange interactions periodically

2021 ◽  
Vol 103 (24) ◽  
Author(s):  
John S. Van Dyke ◽  
Yadav P. Kandel ◽  
Haifeng Qiao ◽  
John M. Nichol ◽  
Sophia E. Economou ◽  
...  
Keyword(s):  
Quantum Information ◽  
Quantum Dot ◽  
Exchange Interactions ◽  
Spin Chains

Quantum Information Transfer in Circuit QED with Landau—Zener Tunneling

2011 ◽  
Vol 28 (9) ◽  
pp. 090302 ◽  
Author(s):  
Jun-Wang Li ◽  
Chun-Wang Wu ◽  
Hong-Yi Dai
Keyword(s):  
Quantum Information ◽  
Information Transfer ◽  
Circuit Qed ◽  
Zener Tunneling

Ultrafast optical control of individual quantum dot spin qubits

2013 ◽  
Vol 76 (9) ◽  
pp. 092501 ◽  
Author(s):  
Kristiaan De Greve ◽  
David Press ◽  
Peter L McMahon ◽  
Yoshihisa Yamamoto
Keyword(s):  
Quantum Dot ◽  
Optical Control ◽  
Spin Qubits ◽  
Ultrafast Optical

scholarly journals Proposal of a full Bell state analyzer for spin qubits in a double quantum dot

2010 ◽  
Vol 81 (16) ◽  
Author(s):  
Nobuhiko Yokoshi ◽  
Hiroshi Imamura ◽  
Hideo Kosaka
Keyword(s):  
Quantum Dot ◽  
Bell State ◽  
Double Quantum ◽  
Spin Qubits ◽  
Double Quantum Dot
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