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 at Bar-Ilan University’s Department of Physics and Institute for Nanotechnology and Advanced Materials 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 (nearly one million times)! Their findings were published 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.
In their work, the researchers replace the electrical nonlinearity that serves as the heart of homodyne detection, which transforms the optical quantum information into a classical electrical signal, with a direct optical nonlinearity, transforming the quantum information into a classical optical signal. Thus, the output signal of the measurement remains in the optical regime, and preserves the enormous bandwidth optical phenomena offers.
“What we’ve done is to offer a direct optical measurement that conserves the information bandwidth, instead of an electrical measurement that compromises the bandwidth of the quantum optical information,” says Dr. Yaakov Shaked, who conducted the research during his Ph.D. studies in the lab of Prof. Avi Pe’er. To demonstrate this idea, the researchers perform a simultaneous measurement of an ultra-broadband quantum optical state, spanning 55THz, presenting non-classical behavior across the entire spectrum. Such a measurement, using standard method, would be practically impossible.
The research was accomplished through collaboration between the Quantum Optics Labs of Prof. Avi Pe’er and Prof. Michael Rosenbluh, together with Yoad Michael, Dr. Rafi Z. Vered and Leon Bello at the Department of Physics and Institute for Nanotechnology and Advanced Materials at Bar-Ilan University.
This new form of quantum measurement is relevant also to other branches of the “second quantum revolution”, such as quantum computing with super powers, quantum sensing with super sensitivity, and quantum imaging with super resolution.
The Latest on: Quantum communication
via Google News
The Latest on: Quantum communication
- Israel joins the race to become a quantum superpower on December 16, 2018 at 10:35 pm
She said quantum communications would also allow for a completely secure communications line. “Anyone who tries to eavesdrop on a call that is on a quantum communication line would be ... […]
- U.S. sees quantum computing an AI as an 'emerging threat' on December 15, 2018 at 7:05 am
A concern drawn from the report is where “adversaries could gain increased access to AI through affordable designs used in the commercial industry, and could apply AI to areas such as weapons and tech... […]
- Did Nick Fury Call CAPTAIN MARVEL in the Past With a ‘Quantum Pager’? on December 14, 2018 at 7:48 am
Think how good quantum communication from an advanced alien civilization like the Kree must have already looked like in the ’90s. What if Captain Marvel was living in the Quantum Realm during ... […]
- US intelligence community says quantum computing and AI pose an ’emerging threat’ to national security on December 13, 2018 at 6:50 pm
and could apply AI to areas such as weapons and technology,” and that “quantum communications could enable adversaries to develop secure communications that U.S. personnel would not be able to ... […]
- Oxford Instruments participates in the launch of the European Quantum Technology Flagship Programme ‘QMiCS’ on December 13, 2018 at 12:20 pm
QMiCS’s long-term visions are developing distributed quantum computing and communication via microwave quantum local area networks (QLANs) and enabling sensing applications based on the illumination o... […]
- Networking goes quantum on December 13, 2018 at 5:04 am
Credit: Murali Krishna - Artist /Designer - [email protected] A scientist involved in expanding quantum communication to a network of users, is continuing his work at the University of ... […]
- Q&A: Quantum Computing’s Researcher Shortage on December 12, 2018 at 4:01 am
Quantum computers could be exponentially faster than today’s supercomputers for a number of applications including factoring large numbers used to encrypt communications. Some observers say the comput... […]
- KETS Quantum Security lands seed funding for chip-scale QKD on December 11, 2018 at 7:26 am
Cost-effective QKD KETS is working on cost-effective approaches to quantum-secured communication, anticipating future applications protecting the transmission of critical information such as banking d... […]
- New optical device brings quantum computing a step closer on December 10, 2018 at 6:28 am
supported by the ARC Centre of Excellence for Quantum Computation and Communication Technology. Co-researcher Professor Elanor Huntington, Dean of the ANU College of Engineering and Computer ... […]
via Bing News