scholarly journals High-performance cavity-enhanced quantum memory with warm atomic cell

2021 ◽  
Author(s):  
Lixia Ma ◽  
Xing Lei ◽  
Jieli Yan ◽  
Ruiyang Li ◽  
Ting Chai ◽  
...  
Keyword(s):  
Quantum Information ◽  
Information Systems ◽  
High Performance ◽  
Quantum Noise ◽  
Electromagnetically Induced Transparency ◽  
Logic Gates ◽  
Quantum Memory ◽  
Excess Noise ◽  
Quantum Logic Gates ◽  
Atomic Cell

Abstract High-performance quantum memory for quantized states of light is a prerequisite building block of quantum information technology. Despite great progresses of optical quantum memories based on interactions of light and atoms, physical features of these memories still can not satisfy the requirement for applications in practical quantum information systems, since all of them suffer from trade off between memory efficiency and excess noise. Here, we report a high-performance cavity-enhanced electromagnetically-induced-transparency memory with warm atomic cell in which a scheme of optimizing the spatial and temporal modes based on the time-reversal approach is applied. A quantum memory with the efficiency up to 78 + 1% and the noise level close to quantum noise limit has been experimentally achieved. The realized quantum memory platform has been capable of preserving quantized optical states, and thus is ready to be applied in quantum information systems, such as distributed quantum logic gates and quantum-enhanced atomic magnetometry.

Generalized methods for the development of quantum logic gates for an NMR quantum information processor

1999 ◽  
Vol 60 (4) ◽  
pp. 2777-2780 ◽  
Author(s):  
Mark D. Price ◽  
Shyamal S. Somaroo ◽  
Amy E. Dunlop ◽  
Timothy F. Havel ◽  
David G. Cory
Keyword(s):  
Quantum Information ◽  
Quantum Logic ◽  
Logic Gates ◽  
Quantum Logic Gates

scholarly journals Implementation of Quantum Gates using MATLAB

2020 ◽  
Vol 8 (5) ◽  
pp. 3693-3699
Keyword(s):  
Quantum Logic ◽  
High Performance ◽  
Low Cost ◽  
Logic Gates ◽  
Activation Function ◽  
Quantum Gates ◽  
Quantum Logic Gates ◽  
Different Types ◽  
The Cost ◽  
Effective Result

Now days we require low cost and high performance computational based applications. Quantum inspired computational device or circuit performs effective result compare to classical based devices. In the development of quantum-based devices and network needs number of quantum logic gates. Here we studied mathematical description of different types of single and multiple qubits-based quantum logic gates, the reversibility property of quantum gates also proved mathematically. We analyze the cost and effectiveness of each quantum gates has been implemented using neural network with the help of MATLAB. The cost and effectiveness of quantum gates has been analyzed with the comparison of different types of activation function.

scholarly journals Effective Hamiltonian theory and its applications in quantum information

2007 ◽  
Vol 85 (6) ◽  
pp. 625-632 ◽  
Author(s):  
D F James ◽  
J Jerke
Keyword(s):  
Quantum Information ◽  
Quantum Logic ◽  
Stochastic Systems ◽  
Logic Gates ◽  
Quantum Systems ◽  
Effective Hamiltonian ◽  
Quantum Logic Gates ◽  
Hamiltonian Theory

This paper presents a useful compact formula for deriving an effective Hamiltonian describing the time-averaged dynamics of detuned quantum systems. The formalism also works for ensemble-averaged dynamics of stochastic systems. To illustrate the technique, we give examples involving Raman processes, Bloch-Siegert shifts, and quantum logic gates. PACS Nos: 03.65.–w

COMPLEXITY, NOISE AND QUANTUM INFORMATION ON ATOM CHIPS

2008 ◽  
Vol 06 (supp01) ◽  
pp. 633-638
Author(s):  
M. A. CIRONE ◽  
A. NEGRETTI ◽  
A. RECATI ◽  
T. CALARCO
Keyword(s):  
Quantum Information ◽  
Quantum Logic ◽  
Logic Gates ◽  
Neutral Atoms ◽  
Quantum Logic Gates ◽  
Atom Chips

The realization of quantum logic gates with neutral atoms on atom chips is investigated, including realistic features, such as noise and actual experimental setups.

Highlights from the Asia Pacific Region

2014 ◽  
Vol 03 (01) ◽  
pp. 28-38
Author(s):  
APPN Editorial Team
Keyword(s):  
Quantum Information ◽  
Quantum Teleportation ◽  
Quantum Communication ◽  
Quantum Information Processing ◽  
Logic Gates ◽  
Building Blocks ◽  
Asia Pacific ◽  
Quantum Computers ◽  
Asia Pacific Region ◽  
Quantum Logic Gates

The laws of quantum mechanics enable optical communications with the ultimate capacity and quantum computers to solve certain problems with unprecedented speed. A key ingredient in such quantum information processing is quantum teleportation: the act of transferring quantum information from a sender to a spatially distant receiver by utilizing shared entanglement and classical communications. For example, optical quantum teleportation is essential for various quantum communication protocols. Quantum logic gates based on optical quantum teleportation are one of the building blocks of optical quantum computers.

TALKING BREATHER QUBITS

2009 ◽  
Vol 23 (20n21) ◽  
pp. 4352-4364
Author(s):  
TOSHIYUKI FUJII ◽  
MUNEHIRO NISHIDA ◽  
SATOSHI TANDA ◽  
NORIYUKI HATAKENAKA
Keyword(s):  
Quantum Information ◽  
Quantum Computer ◽  
Logic Gates ◽  
Bound State ◽  
Elementary Excitation ◽  
Information Networks ◽  
Quantum Mechanical ◽  
Global Information ◽  
Quantum Logic Gates ◽  
New Type

Breather is an elementary excitation regarded as a bound state of a fluxon and an antifluxon in a long Josephson junction. In quantum-mechanical regime, the breather energy is quantized so that the breather can be considered as an artificial moving atom. We propose a new type of fluxon qubit that is constructed by quantum-mechanical superposition of the breather's states. We describe quantum logic gates of breather qubit required for constructing quantum computer. In addition, our qubit can move in the system so that transfer of quntum information is possible between mobile qubits as well as stationary qubits. Our talking qubits support the global information sharing in quantum information networks.

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