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.

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 High-Fidelity Quantum Logic Operations Using Linear Optical Elements

2002 ◽  
Vol 89 (13) ◽  
Author(s):  
J. D. Franson ◽  
M. M. Donegan ◽  
M. J. Fitch ◽  
B. C. Jacobs ◽  
T. B. Pittman
Keyword(s):  
Quantum Logic ◽  
High Fidelity ◽  
Optical Elements ◽  
Linear Optical ◽  
Logic Operations ◽  
Linear Optical Elements

scholarly journals Experimental realization of high-fidelity quantum logic gate between photons

2021 ◽  
Author(s):  
Shuai Shi ◽  
Biao Xu ◽  
Kuan Zhang ◽  
Gen-Sheng Ye ◽  
De-Sheng Xiang ◽  
...  
Keyword(s):  
Quantum Logic ◽  
Information Exchange ◽  
Logic Gate ◽  
Logic Gates ◽  
Building Blocks ◽  
High Fidelity ◽  
Single Photons ◽  
Long Distance ◽  
Experimental Realization ◽  
Quantum Logic Gate

Abstract Quantum logic gates with fidelity above fault-tolerant threshold are building blocks for scalable quantum technologies[1,2]. Compared to other types of qubits, photon is one of a kind due to its unparalleled advantages in long-distance quantum information exchange[3-5]. As a result, high-fidelity photonic quantum operations are not only indispensable for photonic quantum computation[6-8] but also critical for quantum network[2,9]. However, two-qubit photonic quantum logic gate with fidelity comparable to that of leading physical systems, i.e. 99.7% for superconducting circuits[10] and 99.9% for trapped ions[11], has not been achieved. A major limitation is the imperfection of single photons[12]. Here, we overcome this limitation by using high-quality single photons generated from Rydberg atoms as qubits for the interference-based gate protocol, and achieve a gate fidelity up to 99.84(3)%. Our work paves the way for scalable photonic quantum applications[13-15] based on near-optimal single-photon qubits and photon-photon 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.

scholarly journals High-Fidelity Quantum Logic Gates Using Trapped-Ion Hyperfine Qubits

2016 ◽  
Vol 117 (6) ◽  
Author(s):  
C. J. Ballance ◽  
T. P. Harty ◽  
N. M. Linke ◽  
M. A. Sepiol ◽  
D. M. Lucas
Keyword(s):  
Quantum Logic ◽  
Logic Gates ◽  
High Fidelity ◽  
Quantum Logic Gates ◽  
Trapped Ion

Quantum logic gates based on off-resonant cavity-assisted interaction between three-level atoms and single photons

Laser Physics ◽  
2017 ◽  
Vol 27 (7) ◽  
pp. 075202 ◽  
Author(s):  
M Akbari ◽  
S N Andrianov ◽  
A A Kalachev
Keyword(s):  
Quantum Logic ◽  
Resonant Cavity ◽  
Logic Gates ◽  
Single Photons ◽  
Quantum Logic Gates

scholarly journals Universal quantum logic gates in a scalable Ising spin quantum computer

2008 ◽  
Vol 372 (32) ◽  
pp. 5270-5273 ◽  
Author(s):  
G.F. Mkrtchian
Keyword(s):  
Quantum Logic ◽  
Quantum Computer ◽  
Logic Gates ◽  
Quantum Logic Gates ◽  
Ising Spin ◽  
Spin Quantum ◽  
Universal Quantum

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
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