Wright's conjecture on phase retrieval by position, Fourier, and unitary measurements

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Let L2(R)L^2(\mathbb{R}) be the Hilbert space of square-integrable functions, let F\mathcal{F} denote the Fourier transform, and let

AQM={T:L2(R)→L2(R,μ)∣T is unitary and μ is a Borel measure}.\mathcal{A}_{QM}=\left\{T:L^2(\mathbb{R})\rightarrow L^2(\mathbb{R},\mu)\mid T\text{ is unitary and }\mu\text{ is a Borel measure}\right\}.

A tuple of measurement operators does phase retrieval if its associated measurement data determine a state up to the relevant phase equivalence. Wright's conjecture. There exists a unitary operator T∈AQMT\in\mathcal{A}_{QM} such that (Id⁡,F,T)(\operatorname{Id},\mathcal{F},T) does phase retrieval. This extends Pauli's phase-retrieval question by asking whether one additional unitary measurement, besides the identity and Fourier transform, suffices. The source attributes the conjecture to R. Wright and states that it remains open.

References

Primary source

Philippe Jaming and Martin Rathmair, “Uniqueness of phase retrieval from three measurements”, arXiv:2205.08753 (2022).

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