Highly-efficient quantum memory for polarization qubits in a spatially-multiplexed cold atomic ensemble.
TLDR
This work reports on a quantum memory for polarization qubits that combines an average conditional fidelity above 99% and efficiency around 68%, thereby demonstrating a reversible qubit mapping where more information is retrieved than lost.Abstract:
Quantum memory for flying optical qubits is a key enabler for a wide range of applications in quantum information. A critical figure of merit is the overall storage and retrieval efficiency. So far, despite the recent achievements of efficient memories for light pulses, the storage of qubits has suffered from limited efficiency. Here we report on a quantum memory for polarization qubits that combines an average conditional fidelity above 99% and efficiency around 68%, thereby demonstrating a reversible qubit mapping where more information is retrieved than lost. The qubits are encoded with weak coherent states at the single-photon level and the memory is based on electromagnetically-induced transparency in an elongated laser-cooled ensemble of cesium atoms, spatially multiplexed for dual-rail storage. This implementation preserves high optical depth on both rails, without compromise between multiplexing and storage efficiency. Our work provides an efficient node for future tests of quantum network functionalities and advanced photonic circuits.read more
Citations
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Photonic quantum information processing: A concise review
TL;DR: The photonic quantum computing represents an exciting path to medium and large-scale processing as mentioned in this paper, and the development of integrated platforms, improved sources and detectors, novel noise-tolerant theoretical approaches, and more have solidified it as a leading contender for both quantum information processing and quantum networking.
Journal ArticleDOI
Highly Efficient Coherent Optical Memory Based on Electromagnetically Induced Transparency
Ya-Fen Hsiao,Ya-Fen Hsiao,Pin-Ju Tsai,Pin-Ju Tsai,Hung-Shiue Chen,Sheng-Xiang Lin,Sheng-Xiang Lin,Chih-Chiao Hung,Chih-Hsi Lee,Yi-Hsin Chen,Yong Fan Chen,Ite A. Yu,Ying-Cheng Chen +12 more
TL;DR: This work achieves a storage efficiency of 92.0 (1.5)% for a coherent optical memory based on the electromagnetically induced transparency scheme in optically dense cold atomic media and gets a useful time-bandwidth product of 1200, considering only storage where the retrieval efficiency remains above 50%.
Journal ArticleDOI
Efficient quantum memory for single-photon polarization qubits
Yunfei Wang,Jianfeng Li,Shanchao Zhang,Keyu Su,Yu Zhou,Kai-Yu Liao,Shengwang Du,Shengwang Du,Hui Yan,Shi-Liang Zhu,Shi-Liang Zhu +10 more
TL;DR: In this paper, a quantum memory for single-photon polarization qubits with an efficiency of >85% and a fidelity of >99, based on balanced two-channel electromagnetically induced transparency in laser-cooled rubidium atoms, is presented.
Journal ArticleDOI
Photonic quantum information processing: a concise review
TL;DR: This concise review provides a flyover of some key aspects of the field, with a focus on experiment, and promises to out aside its reputation for requiring excessive resource overheads due to inefficient two-qubit gates.
Journal ArticleDOI
Orbital-Angular-Momentum Multiplexed Continuous-Variable Entanglement from Four-Wave Mixing in Hot Atomic Vapor
Xiaozhou Pan,Sheng Yu,Yanfen Zhou,Kun Zhang,Kai Zhang,Shuchao Lv,Sijin Li,Wei Wang,Jietai Jing,Jietai Jing,Jietai Jing +10 more
TL;DR: An experimental implementation of OAM multiplexed continuous variables (CV) entanglement based on a four-wave mixing (FWM) process, in which 13 pairs of entangled Laguerre-Gauss modes, LG_{ℓ,pr} and LG_{-™,conj}, are simultaneously and deterministically generated, shows that there is no entanglements between the modes.
References
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