Interactive measurements

[tobiasBora]

Hello,

First, thanks for this nice project. I'm interesting in using the library behind this project, but is there a way to perform interactive mesurements, i.e. just measure one qubit without measuring everything, so that I can, after receiving the measurement, eventually apply other gates, measure other qubits... Since I want an actual user to provide the measurements to do in real time, gates controlled by measurement outcomes are not enough for my need.

Thanks.

[stewdio]

👋 Hello, Tobias. The short answer is no—and this is because of entanglement. Once qubits are entangled there is no meaningful separation to be made between them; the state of the system is the state of the system and not is de-composable. (This is part of what makes quantum computation so powerful—and so intensive to simulate.)

However, a longer and more open-ended answer… We could step-through the circuit, one moment at a time, and show the system state at each moment. And there are some other aspects we could measure per-register… Perhaps this is a good time for me to raise a hand ✋ and ask for a physicist’s input! (Bueller? Anyone?!)