Exploring the behaviors of electrode-driven Si quantum dot systems: from charge control to qubit operations

Nanoscale ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 332-339
Author(s):  
Ji-Hoon Kang ◽  
Junghee Ryu ◽  
Hoon Ryu
Keyword(s):  
Quantum Dot ◽  
Quantum Logic ◽  
Logic Gates ◽  
Double Quantum ◽  
Quantum Logic Gates ◽  
Multi Scale ◽  
Scale Modeling ◽  
Si Quantum Dot ◽  
Logic Operations ◽  
Qubit Operations

Quantum logic operations and electron spin controls in a Si double quantum dot platform is studied with a multi-scale modeling approach that can open the pathway to explore engineering details for Si-based designs of robust quantum logic gates.

scholarly journals Designs for a two-dimensional Si quantum dot array with spin qubit addressability

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Masahiro Tadokoro ◽  
Takashi Nakajima ◽  
Takashi Kobayashi ◽  
Kenta Takeda ◽  
Akito Noiri ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Quantum Computation ◽  
Quantum Logic ◽  
Large Scale ◽  
Scale Up ◽  
Logic Gates ◽  
Two Dimensional ◽  
Device Design ◽  
Quantum Logic Gates ◽  
Novel Structure

AbstractElectron spins in Si are an attractive platform for quantum computation, backed with their scalability and fast, high-fidelity quantum logic gates. Despite the importance of two-dimensional integration with efficient connectivity between qubits for medium- to large-scale quantum computation, however, a practical device design that guarantees qubit addressability is yet to be seen. Here, we propose a practical 3 × 3 quantum dot device design and a larger-scale design as a longer-term target. The design goal is to realize qubit connectivity to the four nearest neighbors while ensuring addressability. We show that a 3 × 3 quantum dot array can execute four-qubit Grover’s algorithm more efficiently than the one-dimensional counterpart. To scale up the two-dimensional array beyond 3 × 3, we propose a novel structure with ferromagnetic gate electrodes. Our results showcase the possibility of medium-sized quantum processors in Si with fast quantum logic gates and long coherence times.

Deterministic quantum logic gates and quantum cloning based on quantum dot-cavity coupled system

2013 ◽  
Vol 303 ◽  
pp. 56-61 ◽  
Author(s):  
Yan-Qiang Ji ◽  
Jing-Ji Wen ◽  
Yun-Long Wang ◽  
Ai-Dong Zhu ◽  
Hong-Fu Wang ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Quantum Logic ◽  
Logic Gates ◽  
Coupled System ◽  
Quantum Cloning ◽  
Quantum Logic Gates

InGaAs∕InAlAs Double Quantum Wells as Starting Structures for Quantum Logic Gates

2011 ◽  
Author(s):  
M. Marchewka ◽  
E. M. Sheregii ◽  
Giti A. Khodaparast ◽  
Michael B. Santos ◽  
Christopher J. Stanton
Keyword(s):  
Quantum Wells ◽  
Quantum Logic ◽  
Logic Gates ◽  
Double Quantum ◽  
Quantum Logic Gates

scholarly journals ANALYSIS OF AN EXPERIMENTAL QUANTUM LOGIC GATE BY COMPLEMENTARY CLASSICAL OPERATIONS

2006 ◽  
Vol 21 (24) ◽  
pp. 1837-1850 ◽  
Author(s):  
HOLGER F. HOFMANN ◽  
RYO OKAMOTO ◽  
SHIGEKI TAKEUCHI
Keyword(s):  
Quantum Logic ◽  
Logic Gate ◽  
Bell State ◽  
Logic Gates ◽  
Basis Sets ◽  
Entanglement Generation ◽  
Quantum Logic Gates ◽  
State Discrimination ◽  
Logic Operations

Quantum logic gates can perform calculations much more efficiently than their classical counterparts. However, the level of control needed to obtain a reliable quantum operation is correspondingly higher. In order to evaluate the performance of experimental quantum gates, it is therefore necessary to identify the essential features that indicate quantum coherent operation. In this paper, we show that an efficient characterization of an experimental device can be obtained by investigating the classical logic operations on a pair of complementary basis sets. It is then possible to obtain reliable predictions about the quantum coherent operations of the gate such as entanglement generation and Bell state discrimination even without performing these operations directly.

Experimental Progress in Linear Optics Quantum Computing

2003 ◽  
Vol 3 (special) ◽  
pp. 553-562
Author(s):  
J.D. Franson ◽  
M.M. Donegan ◽  
M.J. Fitch ◽  
B.C. Jacobs ◽  
T.B. Pittman
Keyword(s):  
Quantum Logic ◽  
Logic Gates ◽  
Memory Device ◽  
High Fidelity ◽  
Single Photons ◽  
Linear Optics ◽  
Optical Elements ◽  
Quantum Logic Gates ◽  
Feed Forward Control ◽  
Logic Operations

Probabilistic quantum logic operations can be performed using linear optical elements and post-selection based on the results of measurements on ancilla photons. We review the results of a number of recent experiments in this area, including the demonstration of several quantum logic gates, the use of feed-forward control, a new source of single photons, and a quantum memory device for single photons. A high-fidelity approach in which the logic gates always produce an output will also be discussed.

Quantum logic gates by adiabatic passage

2006 ◽  
Vol 135 (1) ◽  
pp. 209-210 ◽  
Author(s):  
X. Lacour ◽  
N. Sangouard ◽  
S. Guérin ◽  
H. R. Jauslin
Keyword(s):  
Quantum Logic ◽  
Logic Gates ◽  
Adiabatic Passage ◽  
Quantum Logic Gates

scholarly journals Supporting Information "Quantum logic gates based on DNAtronics, RNAtronics and Proteintronics"

2021 ◽  
Author(s):  
Sheh-Yi Sheu ◽  
Hua-Yi Hsu ◽  
Dah-Yen Yang
Keyword(s):  
Quantum Logic ◽  
Potential Energy Surfaces ◽  
Logic Gates ◽  
Vacuum System ◽  
Transmission Spectra ◽  
Superposition State ◽  
Quantum Logic Gates ◽  
Energy Surfaces ◽  
Double Well Potential ◽  
Truth Tables

This Supporting Information includes the extended description of the superposition state of the asymmetric double-well system in vacuum system and in solution, truth tables for the residue pairs and their corresponding quantum logic gates, and figures for the double well potential energy surfaces and transmission spectra of the residue pairs. Corresponding Authors Email: [email protected] and [email protected]

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