Quantum state tomography of undetected photons

Autor(en)

Jorge Fuenzalida, Jaroslav Kysela, Krishna Dovzhik, Gabriela Barreto Lemos, Armin Hochrainer, Mayukh Lahiri, Anton Zeilinger

Abstrakt

The measurement of quantum states is one of the most important problems in quantum mechanics. We introduce a quantum state tomography technique in which the state of a qubit is reconstructed, while the qubit remains undetected. The key ingredients are (i) employing an additional qubit, (ii) aligning the undetected qubit with a known reference state by using path identity, and (iii) measuring the additional qubit to reconstruct the undetected qubit state. We establish theoretically and demonstrate experimentally the method with photonic polarization states. The principle underlying our method could also be applied to quantum entities other than photons.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

Österreichische Akademie der Wissenschaften (ÖAW), Universität Wien, Technische Universität Darmstadt, Universidade Federal do Rio de Janeiro, Oklahoma State University-Stillwater

Journal

Physical Review A

Band

109

Anzahl der Seiten

8

ISSN

2469-9926

DOI

https://doi.org/10.48550/arXiv.2211.10304

Publikationsdatum

02-2024

Peer-reviewed

Ja

ÖFOS 2012

103021 Optik, 103025 Quantenmechanik

ASJC Scopus Sachgebiete

Atomic and Molecular Physics, and Optics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/dfcf9213-8d87-48a4-b452-5e375fb43f75