Cryptography Reference
In-Depth Information
(a)
(b)
100
100
10
10
1
1
(c)
(d)
100
100
10
10
1
1
-25
0
25
50
-25
0
25
50
f (kHz)
f (kHz)
(e)
1
10
(f)
0.9
0.8
0.7
5
0.6
0.5
0
0.5
1
1.5
2
r
0
0
5
10
15
20
< X + >
Figure 8.8
access structure. (a) Input amplitude
quadrature; (b) output amplitude quadrature; (c) input phase quadrature; (d) output
phase quadrature spectra of the secret quantum states.
Experimental results for the
{
1,2
}
f is the offset from the sig-
nal frequency. Signal frequency
=
6
.
12 MHz; resolution bandwidth
=
1 kHz; video
bandwidth
30 Hz. (e) Standard deviation contours of Wigner functions of the secret
(dark gray) and extracted (gray) quantum states. (d) Measured fidelity as a function
of gain deviation r 2
=
2 . Gray area highlights the
accessible fidelity region. Points plotted are from six different experimental runs.
X out
X in )
2
X out
X in )
= (
+ (
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