Quantum cryptography is potentially most secure method of sending encrypted information, but does it have speed limit" According to new paper by researchers at National Institute of Standards and Technology and Joint Quantum Institute, technological and security issues will stall maximum transmission rates at levels comparable to that of single broadband connection, such as cable modem, unless researchers reduce “dead times” in detectors that receive quantum-encrypted messages.

For a variety of applications in physics and technology, ranging from quantum information theory to telecommunications, it's handy to have access to pairs of photons created simultaneously, with a chosen energy.