scholarly journals Semiclassical model for the dephasing of a two-electron spin qubit coupled to a coherently evolving nuclear spin bath

2011 ◽  
Vol 84 (3) ◽  
Author(s):  
Izhar Neder ◽  
Mark S. Rudner ◽  
Hendrik Bluhm ◽  
Sandra Foletti ◽  
Bertrand I. Halperin ◽  
...  
Keyword(s):  
Electron Spin ◽  
Nuclear Spin ◽  
Semiclassical Model ◽  
Spin Bath ◽  
Spin Qubit

scholarly journals Controllable freezing of the nuclear spin bath in a single-atom spin qubit

2020 ◽  
Vol 6 (27) ◽  
pp. eaba3442 ◽  
Author(s):  
Mateusz T. Mądzik ◽  
Thaddeus D. Ladd ◽  
Fay E. Hudson ◽  
Kohei M. Itoh ◽  
Alexander M. Jakob ◽  
...  
Keyword(s):  
Electron Spin ◽  
Nuclear Spin ◽  
Quantum Coherence ◽  
Spin Dynamics ◽  
Spin Fluctuations ◽  
Single Atom ◽  
Spin Qubits ◽  
Nuclear Dynamics ◽  
Spin Bath ◽  
Spin Qubit

The quantum coherence and gate fidelity of electron spin qubits in semiconductors are often limited by nuclear spin fluctuations. Enrichment of spin-zero isotopes in silicon markedly improves the dephasing time T2*, which, unexpectedly, can extend two orders of magnitude beyond theoretical expectations. Using a single-atom 31P qubit in enriched 28Si, we show that the abnormally long T2* is due to the freezing of the dynamics of the residual 29Si nuclei, caused by the electron-nuclear hyperfine interaction. Inserting a waiting period when the electron is controllably removed unfreezes the nuclear dynamics and restores the ergodic T2* value. Our conclusions are supported by a nearly parameter-free modeling of the 29Si nuclear spin dynamics, which reveals the degree of backaction provided by the electron spin. This study clarifies the limits of ergodic assumptions in nuclear bath dynamics and provides previously unidentified strategies for maximizing coherence and gate fidelity of spin qubits in semiconductors.

scholarly journals Enhancing the Coherence of a Spin Qubit by Operating it as a Feedback Loop That Controls its Nuclear Spin Bath

2010 ◽  
Vol 105 (21) ◽  
Author(s):  
Hendrik Bluhm ◽  
Sandra Foletti ◽  
Diana Mahalu ◽  
Vladimir Umansky ◽  
Amir Yacoby
Keyword(s):  
Nuclear Spin ◽  
Feedback Loop ◽  
Spin Bath ◽  
Spin Qubit

Electron spin decoherence as a measure of nuclear spin bath frustration

2017 ◽  
Vol 471 ◽  
pp. 435-438 ◽  
Author(s):  
J. Jurec ◽  
B. Rakvin ◽  
M. Jokić ◽  
M. Kveder
Keyword(s):  
Electron Spin ◽  
Nuclear Spin ◽  
Spin Bath ◽  
Spin Decoherence

The Electron Spin Phase Memory Decay of Stable Radical Embedded in Glassy Solvent Matrices: Nuclear Spin Bath Model

2020 ◽  
Author(s):  
Gordan Horvat ◽  
Marina Kveder ◽  
Jiangyang You
Keyword(s):  
Electron Spin ◽  
Nuclear Spin ◽  
Pulse Sequences ◽  
Expansion Method ◽  
Organic Radical ◽  
Spin Bath ◽  
Memory Decay ◽  
Phase Memory ◽  
Dynamics Simulations ◽  
Good Agreement

<pre>We present a new protocol for predicting the phase memory decay/decoherence profiles of electron spin of organic radical molecules embedded in glassy organic solvent matrices at low temperatures. In this approach the microscopic configurations of various glassy solvent matrix systems with nitroxyl radical embedded are prepared using molecular dynamics simulations and simulated annealing. Nuclear spin bath models of embedded radical electron spin decoherence are built for each sample obtained from these configurations. Decoherence profiles under various dynamical decoupling pulse sequences are obtained from these nuclear spin bath models using the cluster correlation expansion method. Our results reflect well the long range disordering nature of glassy structures and show good agreement with their experimental counterparts reported in literature for a variety of organic solvents.</pre>

The Electron Spin Phase Memory Decay of Stable Radical Embedded in Glassy Solvent Matrices: Nuclear Spin Bath Model

2020 ◽  
Author(s):  
Gordan Horvat ◽  
Marina Kveder ◽  
Jiangyang You
Keyword(s):  
Electron Spin ◽  
Nuclear Spin ◽  
Pulse Sequences ◽  
Expansion Method ◽  
Organic Radical ◽  
Spin Bath ◽  
Memory Decay ◽  
Phase Memory ◽  
Dynamics Simulations ◽  
Good Agreement

<pre>We present a new protocol for predicting the phase memory decay/decoherence profiles of electron spin of organic radical molecules embedded in glassy organic solvent matrices at low temperatures. In this approach the microscopic configurations of various glassy solvent matrix systems with nitroxyl radical embedded are prepared using molecular dynamics simulations and simulated annealing. Nuclear spin bath models of embedded radical electron spin decoherence are built for each sample obtained from these configurations. Decoherence profiles under various dynamical decoupling pulse sequences are obtained from these nuclear spin bath models using the cluster correlation expansion method. Our results reflect well the long range disordering nature of glassy structures and show good agreement with their experimental counterparts reported in literature for a variety of organic solvents.</pre>

scholarly journals Relaxation of Shallow Donor Electron Spin Due to Interaction with Nuclear Spin Bath

Nano Letters ◽  
2002 ◽  
Vol 2 (6) ◽  
pp. 651-655 ◽  
Author(s):  
Semion Saykin ◽  
Dima Mozyrsky ◽  
Vladimir Privman
Keyword(s):  
Electron Spin ◽  
Nuclear Spin ◽  
Shallow Donor ◽  
Spin Bath
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