quantum memory
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2022 ◽  
Vol 19 (2) ◽  
pp. 025202
Author(s):  
E A Vashukevich ◽  
E N Bashmakova ◽  
T Yu Golubeva ◽  
Yu M Golubev

Abstract The application of high-dimensional quantum systems (qudits) in quantum computing and communications seems to be a promising avenue due to the possibility of increasing the amount of information encoded in one physical carrier. In this work, we propose a method for implementing single-qudit gates for qudits based on light modes with orbital angular momentum (OAM). Method for logical qudits encoding, which ensures the quasi-cyclicity of operations, is introduced. Based on the protocol for converting the OAM of light in the Raman quantum memory scheme (Vashukevich et al 2020 Phys. Rev. A 101 033830), we show that the considered gates provide an extremely high level of fidelity of single-qudit transformations. We also compare quantum gates’ properties for systems of different dimensions and find the optimal conditions for carrying out transformations in the protocol under consideration.


2022 ◽  
Vol 71 (2) ◽  
pp. 020301-020301
Author(s):  
Ma Teng-fei ◽  
◽  
Wang Min-jie ◽  
Wang Sheng-zhi ◽  
Jiao Hao-le ◽  
...  

Entropy ◽  
2021 ◽  
Vol 23 (12) ◽  
pp. 1595
Author(s):  
Ahmad N. Khedr ◽  
Abdel-Baset A. Mohamed ◽  
Abdel-Haleem Abdel-Aty ◽  
Mahmoud Tammam ◽  
Mahmoud Abdel-Aty ◽  
...  

In the thermodynamic equilibrium of dipolar-coupled spin systems under the influence of a Dzyaloshinskii–Moriya (D–M) interaction along the z-axis, the current study explores the quantum-memory-assisted entropic uncertainty relation (QMA-EUR), entropy mixedness and the concurrence two-spin entanglement. Quantum entanglement is reduced at increased temperature values, but inflation uncertainty and mixedness are enhanced. The considered quantum effects are stabilized to their stationary values at high temperatures. The two-spin entanglement is entirely repressed if the D–M interaction is disregarded, and the entropic uncertainty and entropy mixedness reach their maximum values for equal coupling rates. Rather than the concurrence, the entropy mixedness can be a proper indicator of the nature of the entropic uncertainty. The effect of model parameters (D–M coupling and dipole–dipole spin) on the quantum dynamic effects in thermal environment temperature is explored. The results reveal that the model parameters cause significant variations in the predicted QMA-EUR.


2021 ◽  
Vol 104 (5) ◽  
Author(s):  
Daniel Heineken ◽  
Konstantin Beyer ◽  
Kimmo Luoma ◽  
Walter T. Strunz

2021 ◽  
Vol 127 (21) ◽  
Author(s):  
Jelena V. Rakonjac ◽  
Dario Lago-Rivera ◽  
Alessandro Seri ◽  
Margherita Mazzera ◽  
Samuele Grandi ◽  
...  
Keyword(s):  

2021 ◽  
Author(s):  
Kyoko Mannami ◽  
Takeshi Kondo ◽  
Tomoki Tsuno ◽  
Takuto Miyashita ◽  
Daisuke Yoshida ◽  
...  

2021 ◽  
Vol 104 (4) ◽  
Author(s):  
Chanchal ◽  
G. P. Teja ◽  
Christoph Simon ◽  
Sandeep K. Goyal

Quantum ◽  
2021 ◽  
Vol 5 ◽  
pp. 564
Author(s):  
Matthew B. Hastings ◽  
Jeongwan Haah

We present a quantum error correcting code with dynamically generated logical qubits. When viewed as a subsystem code, the code has no logical qubits. Nevertheless, our measurement patterns generate logical qubits, allowing the code to act as a fault-tolerant quantum memory. Our particular code gives a model very similar to the two-dimensional toric code, but each measurement is a two-qubit Pauli measurement.


Author(s):  
Prasoon K. Shandilya ◽  
David P. Lake ◽  
Matthew J. Mitchell ◽  
Denis D. Sukachev ◽  
Paul E. Barclay
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