High-retrieval efficiency quantum memory for the quantum internet

2020 ◽  
Author(s):  
Laszlo Gyongyosi ◽  
Sandor Imre
Keyword(s):  
Quantum Memory ◽  
Retrieval Efficiency ◽  
Quantum Internet

scholarly journals Optimizing High-Efficiency Quantum Memory with Quantum Machine Learning for Near-Term Quantum Devices

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Laszlo Gyongyosi ◽  
Sandor Imre
Keyword(s):  
Machine Learning ◽  
Signal To Noise Ratio ◽  
Quantum Memory ◽  
Quantum Computers ◽  
Signal To Noise ◽  
Quantum Devices ◽  
Retrieval Efficiency ◽  
Quantum Machine Learning ◽  
Near Term ◽  
Quantum Internet

AbstractQuantum memories are a fundamental of any global-scale quantum Internet, high-performance quantum networking and near-term quantum computers. A main problem of quantum memories is the low retrieval efficiency of the quantum systems from the quantum registers of the quantum memory. Here, we define a novel quantum memory called high-retrieval-efficiency (HRE) quantum memory for near-term quantum devices. An HRE quantum memory unit integrates local unitary operations on its hardware level for the optimization of the readout procedure and utilizes the advanced techniques of quantum machine learning. We define the integrated unitary operations of an HRE quantum memory, prove the learning procedure, and evaluate the achievable output signal-to-noise ratio values. We prove that the local unitaries of an HRE quantum memory achieve the optimization of the readout procedure in an unsupervised manner without the use of any labeled data or training sequences. We show that the readout procedure of an HRE quantum memory is realized in a completely blind manner without any information about the input quantum system or about the unknown quantum operation of the quantum register. We evaluate the retrieval efficiency of an HRE quantum memory and the output SNR (signal-to-noise ratio). The results are particularly convenient for gate-model quantum computers and the near-term quantum devices of the quantum Internet.

scholarly journals Experimental study of retrieval efficiency of Duan-Lukin-Cirac-Zoller quantum memory by optical cavity-enhanced

2022 ◽  
Vol 71 (2) ◽  
pp. 020301-020301
Author(s):  
Ma Teng-fei ◽  
◽  
Wang Min-jie ◽  
Wang Sheng-zhi ◽  
Jiao Hao-le ◽  
...  
Keyword(s):  
Experimental Study ◽  
Optical Cavity ◽  
Quantum Memory ◽  
Retrieval Efficiency

scholarly journals Theory of Noise-Scaled Stability Bounds and Entanglement Rate Maximization in the Quantum Internet

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Laszlo Gyongyosi ◽  
Sandor Imre
Keyword(s):  
Strong Stability ◽  
Entanglement Swapping ◽  
Quantum Memory ◽  
Density Matrices ◽  
Quantum Repeater ◽  
Stability Properties ◽  
Rate Maximization ◽  
Quantum Repeaters ◽  
The Stability ◽  
Quantum Internet

AbstractCrucial problems of the quantum Internet are the derivation of stability properties of quantum repeaters and theory of entanglement rate maximization in an entangled network structure. The stability property of a quantum repeater entails that all incoming density matrices can be swapped with a target density matrix. The strong stability of a quantum repeater implies stable entanglement swapping with the boundness of stored density matrices in the quantum memory and the boundness of delays. Here, a theoretical framework of noise-scaled stability analysis and entanglement rate maximization is conceived for the quantum Internet. We define the term of entanglement swapping set that models the status of quantum memory of a quantum repeater with the stored density matrices. We determine the optimal entanglement swapping method that maximizes the entanglement rate of the quantum repeaters at the different entanglement swapping sets as function of the noise of the local memory and local operations. We prove the stability properties for non-complete entanglement swapping sets, complete entanglement swapping sets and perfect entanglement swapping sets. We prove the entanglement rates for the different entanglement swapping sets and noise levels. The results can be applied to the experimental quantum Internet.

Optimizing the storage and retrieval efficiency of a solid-state quantum memory through tailored state preparation

2007 ◽  
Author(s):  
Matthew D. Eisaman ◽  
Sergey Polyakov ◽  
Michael Hohensee ◽  
Jingyun Fan ◽  
Philip Hemmer ◽  
...  
Keyword(s):  
Solid State ◽  
Quantum Memory ◽  
State Preparation ◽  
Storage And Retrieval ◽  
Retrieval Efficiency

scholarly journals Two-photon bunching inside a quantum memory cell

2020 ◽  
Vol 102 (4) ◽  
Author(s):  
A. S. Losev ◽  
T. Yu. Golubeva ◽  
A. D. Manukhova ◽  
Yu. M. Golubev
Keyword(s):  
Memory Cell ◽  
Quantum Memory ◽  
Two Photon

scholarly journals Towards the Quantum Internet: Satellite Control Plane Architectures and Protocol Design

2021 ◽  
Vol 13 (8) ◽  
pp. 196
Author(s):  
Francesco Chiti ◽  
Romano Fantacci ◽  
Roberto Picchi ◽  
Laura Pierucci
Keyword(s):  
Ad Hoc ◽  
Low Earth Orbit ◽  
Protocol Design ◽  
Control Plane ◽  
Entanglement Generation ◽  
Fiber Technology ◽  
Second Tier ◽  
Systems Architectures ◽  
Quantum Internet ◽  
Master Control

The creation of the future quantum Internet requires the development of new systems, architectures, and communications protocols. As a matter of fact, the optical fiber technology is affected by extremely high losses; thus, the deployment of a quantum satellite network (QSN) composed of quantum satellite repeaters (QSRs) in low Earth orbit would make it possible to overcome these attenuation problems. For these reasons, we consider the design of an ad hoc quantum satellite backbone based on the Software-Defined Networking (SDN) paradigm with a modular two-tier Control Plane (CP). The first tier of the CP is embedded into a Master Control Station (MCS) on the ground, which coordinates the entire constellation and performs the management of the CP integrated into the constellation itself. This second tier is responsible for entanglement generation and management on the selected path. In addition to defining the SDN architecture in all its components, we present a possible protocol to generate entanglement on the end-to-end (E2E) path. Furthermore, we evaluate the performance of the developed protocol in terms of the latency required to establish entanglement between two ground stations connected via the quantum satellite backbone.

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