Extracting the physical sector of quantum states

Mogilevtsev, D.; Teo, Y. S.; Rehacek, J.; Hradil, Z.; Tiedau, J.; Kruse, R.; Harder, G.; Silberhorn, C.; Sanchez-Soto, L. L.

doi:10.1088/1367-2630/aa81b3

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Extracting the physical sector of quantum states

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Sanchez-Soto, L. L.
Quantumness, Tomography, Entanglement, and Codes, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;
Complutense University of Madrid, Dept Opt, Fac Fis;

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Citation

Mogilevtsev, D., Teo, Y. S., Rehacek, J., Hradil, Z., Tiedau, J., Kruse, R., et al. (2017). Extracting the physical sector of quantum states. NEW JOURNAL OF PHYSICS, 19: 093008. doi:10.1088/1367-2630/aa81b3.

Cite as: https://hdl.handle.net/21.11116/0000-0000-8833-D

Abstract

The physical nature of any quantum source guarantees the existence of an effective Hilbert space of finite dimension, the physical sector, in which its state is completely characterized with arbitrarily high accuracy. The extraction of this sector is essential for state tomography. We show that the physical sector of a state, defined in some pre-chosen basis, can be systematically retrieved with a procedure using only data collected from a set of commuting quantum measurement outcomes, with no other assumptions about the source. We demonstrate the versatility and efficiency of the physical-sector extraction by applying it to simulated and experimental data for quantum light sources, as well as quantum systems of finite dimensions.