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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Orbital Angular Momentum Multiplexed Quantum Dense Coding.

Yingxuan Chen¹, Shengshuai Liu¹, Yanbo Lou¹

¹State Key Laboratory of Precision Spectroscopy, Joint Institute of Advanced Science and Technology, School of Physics and Electronic Science, East China Normal University, Shanghai 200062, China.

Physical Review Letters

|September 10, 2021

Summary

This summary is machine-generated.

Researchers enhanced quantum communication capacity by using orbital angular momentum (OAM) multiplexed quantum dense coding (MQDC). This novel MQDC scheme significantly boosts channel capacity beyond conventional methods, paving the way for high-capacity quantum networks.

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Area of Science:

Quantum Information Science
Optical Communications
Quantum Optics

Background:

Conventional quantum dense coding (QDC) faces limitations in channel capacity with fixed quantum resources.
Orbital angular momentum (OAM) offers a promising degree of freedom for multiplexing in quantum communication.

Purpose of the Study:

To experimentally implement and evaluate an OAM multiplexed QDC (MQDC) scheme in a continuous variable system.
To demonstrate that OAM-coded Einstein-Podolsky-Rosen (EPR) entanglement can be utilized for QDC and MQDC.

Main Methods:

Utilized a four-wave mixing process to generate an EPR entanglement source coded on OAM modes.
Implemented QDC using OAM-coded EPR entanglement in a single channel.
Developed and implemented the OAM MQDC scheme using EPR entanglement coded on OAM superposition modes.

Main Results:

Experimentally demonstrated QDC using OAM-coded EPR entanglement.
Successfully implemented the OAM MQDC scheme, achieving substantially enhanced channel capacity compared to conventional QDC.
Showcased that channel capacity can be further improved by increasing the squeezing parameter and the number of multiplexed OAM modes.

Conclusions:

The OAM MQDC scheme significantly surpasses the channel capacity limits of conventional QDC.
This approach provides a viable pathway for constructing high-capacity quantum communication networks.
Further improvements in channel capacity are achievable through optimization of squeezing parameters and OAM mode multiplexing.