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- ほのか あざみ
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1 [1] [2] BB84B92BBM92DPS [3] (1) (2) BB84 (3) DPS [4] [5]
2
3
4
5 BB84 θ θ {0, π} 0 π π, π 2 2 -π/2 π/2 B92 {0, π} Im unbalance unbalance Re
6 DPS 0.1/ {0, π} BBM92 BB84 PBS PBS PBS λ/4 λ/4 PBS
7 BB84 {0, π} {-π/2, π/2} φ a {0, π/2} φ b θ 1 + θ 4 = θ 2 + θ 3 θ 1 + θ 4 = θ 2 + θ 3 + π φ b φ a = 0 φ b φ a = π φ b φ a 0 π/2 -π/2 A/B B 0 A A/B π/2 A/B A π B A/B
8 BB84 φ a φ b 0π/2 {, π} {π/2, 3π/2} φ a = {0, π} φ b = 0 φ a = {-π/2, π/2} φ b = π/2 A B A/B φ b φ 0 π/2 a -π/2 A/B B 0 A A/B π/2 A/B A π B A/B
9 BB84
10 /
11 / - 100%
12 PNS) log) PNS 2 PNS SN (km)
13 BB84 t n 0 n 1 t P2 ( n) = n 0 n 1 tn 0 tn 1 t ' P 2( n 0) t ' P 2( n 1) n 2 e n n 2 t n0 = t' P2 ( n0 ) t n1 = t' P2 ( n1 ) n0 n1 2 ( n0 n1 ) n0 = e n1
14 DPS 0.1/ {0, π} T.... T B A AB
15 DPS 0.1/.... Privacy amplification intercept/resend 0.1/
16 DPS.... QND DPS-QKD log) BB84 DPS SN error (km)
17 [1] [2] BB84B92BBM92DPS [3] (1) (2) BB84 (3) DPS [4] [5]
18 APD
19 Si-APD 60% < 100cps InGaAs-APD 10%10-5 /gate MHz
20 PPLN 0.8 µm Si non-gate (%) (mw) (10 5 cps) (arb.) ( ) (ps)
21
22 ps pulse 60 ps % < 10 cps Time [ns]
23 BB84QKD θ a θ b : plug & play {0, π} {π/2, 3π/2} {0, π/2}
24 10 6 (bps) ?? (km) BB84 (raw key) BB84 (secure key) B92 (raw key) DPS (secure key)
25 DPSQKD LD cw 67ps 1GHz L = 20cm
26 1ns 0 best pol. worst pol. 2 dbfiber-fiber (db) dB
27 DPS-QKD (km) (bit/s)
28 [1] [2] [3] [4] [5]
29 Continuous Variable QKD) Im[E] Re[E] θ
30 CV-QKD lossless measurement / / I AB / / I EB I AB > I EB
31 [1] [2] [3] [4] [5] 10 6 (bps) (km)
32 BBM92 X Y X Y
33 /
34 [1] [2] BB84B92BBM92DPS [3] (1) (2) BB84 (3) DPS [4] [5]
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