ExpTakesueDps

Tier B: Takesue et al. 2007, DPS at 10 GHz over 42.1 dB of channel loss

6/6 passed in 2ms

Test	What it does	Result
test_takesue_dark	Reading "50 Hz" per detector gives a 39.099 dB reach and 0.1944 dB/km at 200 km, against 42.109 dB and 0.2085 dB/km for the pair reading, bracketing their 42.1 dB.	✅ pass
test_takesue_near	At 105 km (21.0 dB) the model gives 17.42 kbit/s against their 17 kbit/s, from 80.07 kclick/s at 2.315% QBER with a 0.64% background share.	✅ pass
test_takesue_reach	Fitting only f(e), the rate crosses zero at 42.109 dB against their 42.1 dB, and their 12.1 bit/s at 200 km inverts to 41.700 dB, 0.2085 dB/km.	✅ pass
test_takesue_slow	Note 23's 1 GHz run gives 3.714% QBER at 41.7 dB, under its 4.1% threshold, and reaches 42.520 dB.	✅ pass
test_takesue_threshold	dps_rate crosses zero at 4.5619% at the Shannon limit, 4.1487% at f = 1.16 and 4.0123% at f = 1.22, their "approximately 4.1%" at mu = 0.2 selecting f = 1.16.	✅ pass
test_takesue_window	Dropping their 36% window cost gives 27.3 kbit/s at 105 km against 17 and a 44.05 dB reach against 42.1, excluding that reading.	✅ pass