B. Khani, Seth T. Merkel, et al.
Physical Review A - AMO
We present methods and results for tomographic measurement of quantum systems through shot-by-shot correlation of individual qubit measurements. Rather than inferring the qubit state after each measurement, we show that averaging of continuous soft values is a valid tomographic strategy and is in fact the better choice in the regime of low signal-to-noise ratio. We experimentally demonstrate a matched filter approach to account for a transient measurement response, and use this to show that tomography of entangled states is feasible despite the asymptotic exponential effort required to obtain N-body corrleations.
B. Khani, Seth T. Merkel, et al.
Physical Review A - AMO
Andrew W. Cross, Easwar Magesan, et al.
npj Quantum Information
Sarah Sheldon, Martin Sandberg, et al.
Applied Physics Letters
Jerry M. Chow, Jay M. Gambetta, et al.
New Journal of Physics