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Quantum Physics

Title: Self-consistent state and measurement tomography with fewer measurements

Abstract: We describe a technique for self consistently characterizing both the quantum state of a single qubit system, and the positive-operator-valued measure (POVM) that describes measurements on the system. The method works with only ten measurements. We assume that a series of unitary transformations performed on the quantum state are fully known, while making minimal assumptions about both the density operator of the state and the POVM. The technique returns maximum-likely estimates of both the density operator and the POVM. To experimentally demonstrate the method, we perform reconstructions of over 300 state-measurement pairs and compare them to their expected density operators and POVMs. We find that 95% of the reconstructed POVMs have fidelities of 0.98 or greater, and 92% of the density operators have fidelities that are 0.98 or greater.
Comments: 14 pages, 9 figures
Subjects: Quantum Physics (quant-ph)
Journal reference: Phys. Rev. A 104, 012416 (2021)
DOI: 10.1103/PhysRevA.104.012416
Cite as: arXiv:2107.00121 [quant-ph]
  (or arXiv:2107.00121v1 [quant-ph] for this version)

Submission history

From: Mark Beck [view email]
[v1] Wed, 30 Jun 2021 22:01:52 GMT (4310kb,D)

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