Quantum Cryptography
Systems   Theory   Single Photon Sources

Philippe Grangier, Institute of Optics
Orsay Cedex, France

Ataç Imamoglu, University of California at Santa Barbara
Santa Barbara, California

Andrew Shields, Toshiba Cambridge Research Laboratory
Cambridge, England

Yoshihisa Yamamoto, Stanford University
Palo Alto, California

What to Look For

Equipment and capabilities:

Electric, room-temperature single-photon sources
Gigahertz single-photon sources
Efficient sources of entangled photons
Gigahertz entangled-photon sources
Efficient room-temperature photon detectors
Gigahertz photon detectors
Quantum repeaters or relays
Gigahertz quantum repeaters
Multi-photon quantum cryptography


Gigabit-per-second point-to-point
Via satellite
On a network
On the Internet

Threat levels:

10-qubit quantum computer (practical quantum systems possible)
100-qubit quantum computer (large-scale within a decade)
1,000-qubit quantum computer (encryption codes compromised)

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