Forging a quantum leap in quantum communication

phys.org | 2/9/2018 | Staff
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Quantum communication, which ensures absolute data security, is one of the most advanced branches of the "second quantum revolution". In quantum communication, the participating parties can detect any attempt at eavesdropping by resorting to the fundamental principle of quantum mechanics - a measurement affects the measured quantity. Thus, the mere existence of an eavesdropper can be detected by identifying the traces that his measurements of the communication channel leave behind.

The major drawback of quantum communication today is the slow speed of data transfer, which is limited by the speed at which the parties can perform quantum measurements.

Researchers - Bar-Ilan - University - Method - Speed

Researchers at Bar-Ilan University have devised a method that overcomes this "speed limit", and enables an increase in the rate of data transfer by more than 5 orders of magnitude! Their findings were published today in the journal Nature Communications.

Homodyne detection is a cornerstone of quantum optics, acting as a fundamental tool for processing quantum information. However, the standard homodyne method suffers from a strong bandwidth limitation. While quantum optical phenomena, exploited for quantum communication, can easily span a bandwidth of many THz, the standard processing methods of this information are inherently limited to the electronically accessible MHz-to-GHz range, leaving a dramatic gap between the relevant optical phenomena that is used for carrying the quantum information, and the capability to measure it. Thus, the rate at which quantum information can be processed is strongly limited.

Work - Researchers

In their work, the researchers replace the...
(Excerpt) Read more at: phys.org
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