Quantum state tomography of undetected photons

• URL: http://arxiv.org/abs/2211.10304v2
• Date: Sat, 22 Jul 2023 15:37:02 GMT
• Title: Quantum state tomography of undetected photons
• Authors: Jorge Fuenzalida, Jaroslav Kysela, Krishna Dovzhik, Gabriela Barreto Lemos, Armin Hochrainer, Mayukh Lahiri, and Anton Zeilinger
• Abstract summary: We introduce a quantum state tomography technique in which the state of a qubit is reconstructed, while the qubit remains undetected. The principle underlying our method could also be applied to quantum entities other than photons.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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 theoretically establish and experimentally demonstrate the method with photonic polarization states. The principle underlying our method could also be applied to quantum entities other than photons.

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