Heralded Universal Quantum Gate and Entangler Assisted by Imperfect Double-Sided Quantum-Dot-Microcavity Systems

2018 ◽  
Vol 530 (8) ◽  
pp. 1800071 ◽  
Author(s):  
Hai-Rui Wei ◽  
Ning-Yang Chen ◽  
Ji-Zhen Liu
Keyword(s):  
Quantum Dot ◽  
Quantum Gate ◽  
Universal Quantum

Universal quantum computation with quantum-dot cellular automata in decoherence-free subspace

2008 ◽  
Vol 8 (10) ◽  
pp. 977-985
Author(s):  
Z.-Y. Xu ◽  
M. Feng ◽  
W.-M. Zhang
Keyword(s):  
Cellular Automata ◽  
Quantum Dot ◽  
Quantum Computation ◽  
Two Dimensions ◽  
High Fidelity ◽  
Electron Pairs ◽  
Quantum Dot Cellular Automata ◽  
Single Spin ◽  
Universal Quantum ◽  
Decoherence Free Subspace

We investigate the possibility to have electron-pairs in decoherence-free subspace (DFS), by means of the quantum-dot cellular automata (QCA) and single-spin rotations, to deterministically carry out a universal quantum computation with high-fidelity. We show that our QCA device with electrons tunneling in two dimensions is very suitable for DFS encoding, and argue that our design favors a scalable quantum computation robust to collective dephasing errors.

The implementation of universal quantum memory and gates based on large-scale diamond surface

2016 ◽  
Vol 14 (05) ◽  
pp. 1650026
Author(s):  
Xiao-Ning Qi ◽  
Yong Zhang
Keyword(s):  
Quantum State ◽  
Large Scale ◽  
Quantum Memory ◽  
Quantum Gate ◽  
Nitrogen Vacancy ◽  
Diamond Surface ◽  
Single Qubit ◽  
Model Based ◽  
Universal Quantum ◽  
Jc Model

Nitrogen-vacancy (NV) centers implanted beneath the diamond surface have been demonstrated to be effective in the processing of controlling and reading-out. In this paper, NV center entangled with the fluorine nuclei collective ensemble is simplified to Jaynes–Cummings (JC) model. Based on this system, we discussed the implementation of quantum state storage and single-qubit quantum gate.

QUANTUM COMPUTATION BASED ON ELECTRON SPIN QUBITS WITHOUT SPIN-SPIN INTERACTION

2005 ◽  
Vol 03 (supp01) ◽  
pp. 155-162
Author(s):  
YIN-ZHONG WU ◽  
WEI-MIN ZHANG ◽  
CHOPIN SOO
Keyword(s):  
Cellular Automata ◽  
Quantum Dot ◽  
Quantum Computation ◽  
Electron Spin ◽  
Electron Tunneling ◽  
Entangled State ◽  
Spin Interaction ◽  
Quantum Dot Cellular Automata ◽  
Universal Quantum ◽  
Coherent Quantum

Using electron spin states in a unit cell of three semiconductor quantum dots as qubit states, a scalable quantum computation scheme is advocated without invoking qubit-qubit interactions. Single electron tunneling technology and coherent quantum-dot cellular automata architecture are used to generate an ancillary charge entangled state which is then converted into spin entangled state. Without using charge measurement and ancillary qubits, we demonstrate universal quantum computation based on free electron spin and coherent quantum-dot cellular automata.

High-Fidelity Hybrid Universal Quantum Controlled Gates on Photons and Quantum-Dot Spins

2021 ◽  
Author(s):  
Yu-Hong Han ◽  
Cong Cao ◽  
Li Zhang ◽  
Xin Yi ◽  
Pan-Pan Yin ◽  
...  
Keyword(s):  
Quantum Dot ◽  
High Fidelity ◽  
Universal Quantum

scholarly journals PERMUTATION AND ITS PARTIAL TRANSPOSE

2007 ◽  
Vol 05 (04) ◽  
pp. 469-507 ◽  
Author(s):  
YONG ZHANG ◽  
LOUIS H. KAUFFMAN ◽  
REINHARD F. WERNER
Keyword(s):  
Knot Theory ◽  
Rational Solution ◽  
Quantum Gate ◽  
Baxter Equation ◽  
Link Invariant ◽  
Braid Relation ◽  
Linking Numbers ◽  
Identity Permutation ◽  
Partial Transpose ◽  
Universal Quantum

Permutation and its partial transpose play important roles in quantum information theory. The Werner state is recognized as a rational solution of the Yang–Baxter equation, and the isotropic state with an adjustable parameter is found to form a braid representation. The set of permutation's partial transposes is an algebra called the PPT algebra, which guides the construction of multipartite symmetric states. The virtual knot theory, having permutation as a virtual crossing, provides a topological language describing quantum computation as having permutation as a swap gate. In this paper, permutation's partial transpose is identified with an idempotent of the Temperley–Lieb algebra. The algebra generated by permutation and its partial transpose is found to be the Brauer algebra. The linear combinations of identity, permutation and its partial transpose can form various projectors describing tangles; braid representations; virtual braid representations underlying common solutions of the braid relation and Yang–Baxter equations; and virtual Temperley–Lieb algebra which is articulated from the graphical viewpoint. They lead to our drawing a picture called the ABPK diagram describing knot theory in terms of its corresponding algebra, braid group and polynomial invariant. The paper also identifies non-trivial unitary braid representations with universal quantum gates, derives a Hamiltonian to determine the evolution of a universal quantum gate, and further computes the Markov trace in terms of a universal quantum gate for a link invariant to detect linking numbers.

scholarly journals Type-II quantum-dot-in-nanowire structures with large oscillator strength for optical quantum gate applications

2017 ◽  
Vol 96 (12) ◽  
Author(s):  
Masoomeh Taherkhani ◽  
Morten Willatzen ◽  
Jesper Mørk ◽  
Niels Gregersen ◽  
Dara P. S. McCutcheon
Keyword(s):  
Quantum Dot ◽  
Oscillator Strength ◽  
Quantum Gate ◽  
Type Ii
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