High-fidelity quantum memory realized via Wigner crystals of polar molecules

2012 ◽  
Vol 21 (1) ◽  
pp. 010308 ◽  
Author(s):  
Peng Xue ◽  
Jian-Zhi Wu
Keyword(s):  
Quantum Memory ◽  
Polar Molecules ◽  
High Fidelity ◽  
Wigner Crystals

scholarly journals High-fidelity polarization storage in a gigahertz bandwidth quantum memory

2012 ◽  
Vol 45 (12) ◽  
pp. 124008 ◽  
Author(s):  
D G England ◽  
P S Michelberger ◽  
T F M Champion ◽  
K F Reim ◽  
K C Lee ◽  
...  
Keyword(s):  
Quantum Memory ◽  
High Fidelity

Nanophotonic rare-earth quantum memory with optically controlled retrieval

Science ◽  
2017 ◽  
Vol 357 (6358) ◽  
pp. 1392-1395 ◽  
Author(s):  
Tian Zhong ◽  
Jonathan M. Kindem ◽  
John G. Bartholomew ◽  
Jake Rochman ◽  
Ioana Craiciu ◽  
...  
Keyword(s):  
Frequency Comb ◽  
Essential Elements ◽  
Quantum Memory ◽  
High Fidelity ◽  
Long Distance ◽  
Quantum Networks ◽  
Network Nodes ◽  
Readout Time ◽  
On Chip ◽  
Photon Source

Optical quantum memories are essential elements in quantum networks for long-distance distribution of quantum entanglement. Scalable development of quantum network nodes requires on-chip qubit storage functionality with control of the readout time. We demonstrate a high-fidelity nanophotonic quantum memory based on a mesoscopic neodymium ensemble coupled to a photonic crystal cavity. The nanocavity enables >95% spin polarization for efficient initialization of the atomic frequency comb memory and time bin–selective readout through an enhanced optical Stark shift of the comb frequencies. Our solid-state memory is integrable with other chip-scale photon source and detector devices for multiplexed quantum and classical information processing at the network nodes.

scholarly journals Dipolar exchange quantum logic gate with polar molecules

2018 ◽  
Vol 9 (33) ◽  
pp. 6830-6838 ◽  
Author(s):  
Kang-Kuen Ni ◽  
Till Rosenband ◽  
David D. Grimes
Keyword(s):  
Quantum Logic ◽  
Logic Gate ◽  
Dipolar Interaction ◽  
Quantum Gate ◽  
Polar Molecules ◽  
High Fidelity ◽  
Quantum Logic Gate ◽  
Internal Coherence

Proposed molecular quantum gate takes advantage of internal coherence and resonant electric dipolar interaction with high fidelity and optical scalability.

scholarly journals Designing a practical high-fidelity long-time quantum memory

2013 ◽  
Vol 4 (1) ◽  
Author(s):  
Kaveh Khodjasteh ◽  
Jarrah Sastrawan ◽  
David Hayes ◽  
Todd J. Green ◽  
Michael J. Biercuk ◽  
...  
Keyword(s):  
Quantum Memory ◽  
High Fidelity ◽  
Time Quantum ◽  
Long Time

scholarly journals High-fidelity quantum memory utilizing inhomogeneous nuclear polarization in a quantum dot

2014 ◽  
Vol 90 (23) ◽  
Author(s):  
Wenkui Ding ◽  
Anqi Shi ◽  
J. Q. You ◽  
Wenxian Zhang
Keyword(s):  
Quantum Dot ◽  
Nuclear Polarization ◽  
Quantum Memory ◽  
High Fidelity

scholarly journals Long Lifetime and High-Fidelity Quantum Memory of Photonic Polarization Qubit by Lifting Zeeman Degeneracy

2013 ◽  
Vol 111 (24) ◽  
Author(s):  
Zhongxiao Xu ◽  
Yuelong Wu ◽  
Long Tian ◽  
Lirong Chen ◽  
Zhiying Zhang ◽  
...  
Keyword(s):  
Quantum Memory ◽  
High Fidelity ◽  
Long Lifetime

scholarly journals High-fidelity quantum gates for OAM single qudits on quantum memory

2022 ◽  
Vol 19 (2) ◽  
pp. 025202
Author(s):  
E A Vashukevich ◽  
E N Bashmakova ◽  
T Yu Golubeva ◽  
Yu M Golubev
Keyword(s):  
Quantum Systems ◽  
Quantum Memory ◽  
Quantum Gates ◽  
High Fidelity ◽  
Optimal Conditions ◽  
Memory Scheme ◽  
Different Dimensions ◽  
Single Qudit ◽  
High Level ◽  
Promising Avenue

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.

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