The Promise of Quantum Information. SPS Detector X Detector Y Path A Path B Paths A & B going toward Y destructively interfere: Y never fires Quantum.

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Presentation transcript:

The Promise of Quantum Information

SPS Detector X Detector Y Path A Path B Paths A & B going toward Y destructively interfere: Y never fires Quantum Bomb Detection (Single Photon Source)

SPS Detector X Detector Y Path A Path B Quantum Bomb Detection

SPS Detector X Detector Y Path A Path B EventProb.Conclusion X fires¼Ambiguous Y fires¼There was a bomb Bang!½There was a bomb, but… Quantum Bomb Detection S. Adams, Phys. Educ. 33 (6), , Nov. 1998

Quantum Metrology  x x/ x/ P. Kok, et. al, OPN, p , Sept. 2002

Quantum Cryptography Alice Bob = 1 = 0 + or x Eve N. Gisin, et al., Rev. Mod. Phys. 74, (2002)

Single Photons

Measuring antibunching 76 MHz repetition rate, ~6 ps pulsed-laser excitation at 532 nm coincidence counts 0 interphoton times CW excitation at 532 nm

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