Figure 7
From: Fock state-enhanced expressivity of quantum machine learning models
(a) Series encoding scheme that utilised all spatial mode within the data encoding block and maximize the photon-number dependent expressive power of the linear QPCs. (b) Parallel encoding scheme that generates the same set of frequency spectrum as in (a). (c) Series encoding scheme and (d) parallel encoding scheme that generate full frequency spectrum for d-dimensional Fourier series. The former demands \(2^{d} - 1\) data encoding phase shifters while the later requires only d phase shifters distributed equally among d data encoding blocks