The discussion focuses on calculating the number of photons per pulse emitted by a laser diode in a Quantum Key Distribution experiment. Key parameters required for this calculation include the average power of the laser diode, pulse repetition rate, pulse duration, and the frequency of the generated light. The energy per pulse can be derived from the average power and pulse characteristics, while the energy per photon is determined using the formula E = hν, where ν is the frequency of the light. This method provides a definitive approach to estimating photon numbers in weak laser pulse applications.
PREREQUISITESUndergraduate students, researchers in quantum optics, and professionals involved in Quantum Key Distribution experiments will benefit from this discussion.
Sorry about the Unclear question, I have only the data about average power of laser diode but have no idea to calculate the photon number per pulse in the experiment.f95toli said:It is not entirely clear what you are asking. What information do you have? Do you have some way of measuring the energy/pulse (before the attenuators) directly?
I am not an expert in this field (I've done some work on single microwave photons, but that is a bit different) but presumably you could get a good estimate if you know the average power and duty cycle of your laser as well as the frequency of the generated light.
I hope that is the output power, not the power consumed ?Pattarasak said:I have only the data about average power of laser diode