Cryptography Reference
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250
IN = 0 1 0 2
IN = 0 1 1 2
200
150
100
50
0
1 1'
0 1'
1 1'
0 1'
250
IN = 1 1 1 2
IN = 1 1 0 2
200
150
100
50
0
0 1'
1 1'
0 1'
1 1'
Figure 6.6 Experimental results from a demonstration of a quantum parity check
operation. (Reprinted with permission from T.B. Pittman, B.C. Jacobs, and J.D. Franson,
Phys. Rev. Lett., 88, 257902, 2002. Copyright 2002 by the American Physical Society.)
detector
PBS- 1
α
0+
β
1
input
encoded output
α
00+
β
11
+
Φ
Bell state
Figure 6.7 Implementation of a quantum encoder using a polarizing beam splitter
(PBS) and an entangled pair of ancilla photons.
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