Creation of charged excitons with two-color excitation method and initialization of electron spin qubit in quantum dots

2011 ◽  
Vol 98 (3) ◽  
pp. 032101 ◽  
Author(s):  
Hideki Gotoh ◽  
Haruki Sanada ◽  
Hidehiko Kamada ◽  
Hiroshi Yamaguchi ◽  
Tetsuomi Sogawa
Keyword(s):  
Quantum Dots ◽  
Electron Spin ◽  
Spin Qubit ◽  
Excitation Method

Engineering Electronic Structure to Protect Phase Memory in Molecular Qubits by Minimising Orbital Angular Momentum

2018 ◽  
Author(s):  
Ana Maria Ariciu ◽  
David H. Woen ◽  
Daniel N. Huh ◽  
Lydia Nodaraki ◽  
Andreas Kostopoulos ◽  
...  
Keyword(s):  
Electron Spin ◽  
Quantum Coherence ◽  
Quantum Information Processing ◽  
Pulse Sequences ◽  
Grover Algorithm ◽  
Ligand Shell ◽  
Information Strategies ◽  
Spin Qubit ◽  
Molecular Spin ◽  
The Impact

Using electron spins within molecules for quantum information processing (QIP) was first proposed by Leuenberger and Loss (1), who showed how the Grover algorithm could be mapped onto a Mn12 cage (2). Since then several groups have examined two-level (S = ½) molecular spin systems as possible qubits (3-12). There has also been a report of the implementation of the Grover algorithm in a four-level molecular qudit (13). A major challenge is to protect the spin qubit from noise that causes loss of phase information; strategies to minimize the impact of noise on qubits can be categorized as corrective, reductive, or protective. Corrective approaches allow noise and correct for its impact on the qubit using advanced microwave pulse sequences (3). Reductive approaches reduce the noise by minimising the number of nearby nuclear spins (7-11), and increasing the rigidity of molecules to minimise the effect of vibrations (which can cause a fluctuating magnetic field via spin-orbit coupling) (9,11); this is essentially engineering the ligand shell surrounding the electron spin. A protective approach would seek to make the qubit less sensitive to noise: an example of the protective approach is the use of clock transitions to render spin states immune to magnetic fields at first order (12). Here we present a further protective method that would complement reductive and corrective approaches to enhancing quantum coherence in molecular qubits. The target is a molecular spin qubit with an effective 2S ground state: we achieve this with a family of divalent rare-earth molecules that have negligible magnetic anisotropy such that the isotropic nature of the electron spin renders the qubit markedly less sensitive to magnetic noise, allowing coherent spin manipulations even at room temperature. If combined with the other strategies, we believe this could lead to molecular qubits with substantial advantages over competing qubit proposals.<br>

scholarly journals Submillisecond electron spin relaxation in InP quantum dots

2005 ◽  
Vol 72 (15) ◽  
Author(s):  
Michio Ikezawa ◽  
Bipul Pal ◽  
Yasuaki Masumoto ◽  
Ivan V. Ignatiev ◽  
Sergey Yu. Verbin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Spin Relaxation ◽  
Electron Spin ◽  
Electron Spin Relaxation ◽  
Inp Quantum Dots

Electron-spin-resonance meanderlines for effective spin control in Si quantum dots for large-scale qubit applications

2021 ◽  
Vol 119 (24) ◽  
pp. 243503
Author(s):  
Yao-Chun Chang ◽  
Ian Huang ◽  
Chiung-Yu Chen ◽  
Min-Jui Lin ◽  
Shih-Yuan Chen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Large Scale ◽  
Effective Spin ◽  
Spin Resonance ◽  
Si Quantum Dots

Electron Spin Resonance in Heterostructures with Ring Molecules of GeSi Quantum Dots

JETP Letters ◽  
2021 ◽  
Vol 113 (1) ◽  
pp. 52-56
Author(s):  
A. F. Zinovieva ◽  
V. A. Zinovyev ◽  
A. V. Nenashev ◽  
A. A. Shklyaev ◽  
L. V. Kulik ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Ring Molecules ◽  
Spin Resonance

Electron spin resonance in double quantum dots

2008 ◽  
Vol 40 (5) ◽  
pp. 1457-1459 ◽  
Author(s):  
Rafael Sánchez ◽  
Carlos López-Monís ◽  
Jesús Iñarrea ◽  
Gloria Platero
Keyword(s):  
Quantum Dots ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Double Quantum ◽  
Double Quantum Dots ◽  
Spin Resonance

CONTROLLED TELEPORTATION OF ELECTRON SPIN STATE IN QUANTUM DOT VIA SINGLE PHOTON

2008 ◽  
Vol 06 (03) ◽  
pp. 553-560
Author(s):  
YAN-WEI WANG ◽  
MING-FENG WANG ◽  
YI-ZHUANG ZHENG
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Electron Spin ◽  
Spin State ◽  
Faraday Rotation ◽  
Quantum Teleportation ◽  
Single Photon ◽  
Controlled Teleportation ◽  
Controlled Quantum Teleportation ◽  
Qubit System

A controlled quantum teleportation scheme of electron spin state in a quantum dot is proposed. With the entanglement generating through the interaction between the quantum dots in microcavities and a single photon, the controlled teleportation can be implemented using Faraday rotation and single photon measurements. The scheme can be easily generalized to multi-qubit system.

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