Security in Computing (3rd Edition)

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1 Umesh V. Vazirani CS 161/194-1 November 28, 2005 Quantum Cryptography Why Quantum Cryptography? Unconditional security - Quantum computers can solve certain tasks exponentially faster; including quantum factoring algorithm. - you can learn more about this in cs191. Measurement disturbs quantum state - detecting eavesdropper
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2 Quantum Mechanics I think I can safely say that nobody understands quantum Mechanics. -Richard Feynman
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3 Polarization of Light Photon Polarization Light waves are propagated as discrete quanta called photons. The polarization of the photon is a direction in the plane normal to the direction of propagation. A polarizing filter blocks photons whose polarization is perpendicular to the orientation of the filter and transmits photons whose polarization is aligned with the filter.
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4 The probability that the photon is transmitted by the second filter is Photon Polarization q 2 cos Vertical filter Filter at angle q light polarized vertically q angle at polarized light light d unpolarize Photon polarization
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5 Transmitting a Bit
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Quantum cryptography - Quantum Cryptography Umesh V....

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