A distributed protocol lets one party characterize a lossy linear-optical network during randomized boson sampling by using heterodyne measurements on shared squeezed light, with effort that grows linearly in the number of modes.
(A23) The factor ⏐⏐⟨nB|U| nA⟩ ⏐⏐ is zero unless|nB| =|nA|, so it gives the indicated restriction on the sum
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In situ characterization of linear-optical networks in randomized boson sampling
A distributed protocol lets one party characterize a lossy linear-optical network during randomized boson sampling by using heterodyne measurements on shared squeezed light, with effort that grows linearly in the number of modes.