Daylight Quantum Key Distributionover 1.6 km

• Cryptographic key generation byquantum communications in daylight

  • 1.6-km daylight transmissions demonstrated

• New, transportable system for ranges < 10 km

  • Continuous, unattended operation
  • Serve as model for satellite system
  • 2001 R&D 100 award winner

• Future: a satellite experiment ?

Receiver ìBobî

Transmitter ìAliceî

Sample of key material: 0.5-km range in daylight

A: 01001100 10110000 11011000 10111100 11010111

B: 01001000 10110000 11011000 10110100 11010111

Ý

A: 01110001 00101000 11010101 11000100 10100001

B: 01110001 00101000 11010101 11000100 10100001

1-MHz sending rate; 35-kHz bit rate; 5% BER; htotal ~ 0.2

IM-1 02-0752 (3/02)

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