Quantum communication

Zero-Signal-Power Communication: Zero-Power Classical Communication, Zero-Quantum Quantum Communication and Environmental-Noise Communication

A new physical way of communication, communication by the inherent background noise, is proposed which does not need net energy transfer in the information channel. The communicator devices do dissipate energy however they do not emit net energy into the channel, instead of that, they modulate the parameters of inherent spontaneous fluctuations in the channel. The new method can use two differe...

Quantum Direct Communication

Quantum communication technology

Quantum communication is built on a set of disruptive concepts and technologies. It is driven by fascinating physics and by promising applications. It requires a new mix of competencies, from telecom engineering to theoretical physics, from theoretical computer science to mechanical and electronic engineering. First applications have already found their way into niche markets, and university la...

Optimizing quantum communication

As quantum computing moves closer to real-world application, engineers are considering how to meet the challenge of transmitting quantum information faithfully down long, noisy optical fibers. The fidelity with which an entangled photon pair can be sent down a fiber decreases exponentially with distance, requiring repeater nodes spaced 10 km apart. Liang Jiang et al. report an approach to findi...

Feedback in Quantum Communication

Communication is primarily the generation of correlations between two parties. The transmission of information is undertaken to correlate the received message with an possible set of transmitted messages. In the classical theory of information the maximum rate of information transmission through a memoryless channel is given by a measure of the maximum correlation that may be generated through ...