All current methods of secure communication such as public-key
cryptography can eventually be broken by faster computing. At the
interface of physics and computer science lies a powerful solution
for secure communications: quantum cryptography. Because
eavesdropping changes the physical nature of the information, users
in a quantum exchange can easily detect eavesdroppers. This allows
for totally secure random key distribution, a central requirement
for use of the one-time pad. Since the one-time pad is
theoretically proven to be undecipherable, quantum cryptography is
the key to perfect secrecy. Quantum Communications and Cryptography
is the first comprehensive review of the past, present, and
potential developments in this dynamic field. Leading expert
contributors from around the world discuss the scientific
foundations, experimental and theoretical developments, and
cutting-edge technical and engineering advances in quantum
communications and cryptography. The book describes the engineering
principles and practical implementations in a real-world
metropolitan network as well as physical principles and
experimental results of such technologies as entanglement swapping
and quantum teleportation. It also offers the first detailed
treatment of quantum information processing with continuous
variables. Technologies include both free-space and fiber-based
communications systems along with the necessary protocols and
information processing approaches. Bridging the gap between physics
and engineering, Quantum Communications and Cryptography supplies a
springboard for further developments and breakthroughs in this
rapidly growing area.
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