Robustness of quantum Fourier transform interferometry. (arXiv:1711.07153v1 [quant-ph])

Boson Sampling photonic networks can be used to obtain Heisenberg limited
measurements of optical phase gradients, by using quantum Fourier transform
interferometry. Here, we use phase-space techniques and the complex
P-distribution, to simulate a $100$ qubit Fourier transform interferometer with
additional random phases, to simulate decoherence. This is far larger than
possible in conventional calculations of matrix permanents, which is the
standard technique for such calculations. Our results show that this quantum
metrology technique is robust against phase decoherence, and one can also
measure lower order correlations without substantial degradation.

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