Mastodawn

Phase Noise Test Set Parts? While looking for wire-wrap tools in the garage, ran across bag of the HP11729 phase noise test set modules saved from a scrapped unit. Have the Low Noise Amp, 640 MHz filter/driver-amp & comb generator, and IF Amplifier modules. Not enough to replicate the full features of the HP11729, but might be fun to fire them up and see what works. Starting tests with the 640 MHz bandpass filter. #TestEquipment #PhaseNoise #RFTest

katch wreck Apr 7, 2023

https://www.nature.com/articles/s41566-023-01190-4

"Here we provide an exact calculation of the quantum, private, two-way assisted quantum and secret-key-agreement capacities of all bosonic dephasing channels. We prove that they are equal to the relative entropy of the distribution underlying the channel with respect to the uniform distribution, solving a problem that was originally posed over a decade ago."

#quantumComputing #phaseNoise #bosoonicDephasing #information

Exact solution for the quantum and private capacities of bosonic dephasing channels - Nature Photonics

An exact solution for the quantum and private capacities of bosonic dephasing channels is provided. The authors prove that these capacities are equal to the relative entropy of the distribution underlying the channel with respect to the uniform distribution.

Nature