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Fourier state tomography of quantum light
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Nano Physics. Centre for Disruptive Photonics Technologies, SPMS, TPI, Nanyang technological University, 21 Nanyang link, 637371, Singapore; School of Physical and Mathematical Sciences, Interdisciplinary Graduate Programme, Nanyang technological University, 21 Nanyang link, 637371, Singapore.ORCID iD: 0009-0006-9860-3468
KTH, School of Engineering Sciences (SCI), Applied Physics.
Centre for Disruptive Photonics Technologies, SPMS, TPI, Nanyang technological University, 21 Nanyang link, 637371, Singapore.
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Nano Physics.ORCID iD: 0000-0002-5726-1063
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2025 (English)In: 2025 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2025, Institute of Electrical and Electronics Engineers (IEEE) , 2025Conference paper, Published paper (Refereed)
Abstract [en]

Quantum state tomography is used in quantum communication, computing, and cryptography to characterize quantum states enabling assessment and control of quantum systems. Rapidly scaling quantum technologies require fast, accurate, and simple techniques, but current tomography methods are bulky, hard to scale, and slow. To overcome these limitations, we experimentally demonstrate Fourier tomography [1], of single-photon and entangled photon pairs generated by a quantum dot. As shown in Fig. 1(a) for two-photon tomography, the setup consists of a continuously rotating quarter waveplate, a fixed linear polarizer and a single photon detector per qubit. As the waveplates rotates with different speed, we record the coincidences rate between the two detectors. This signal can be expressed as a Fourier series whose coefficients can be related to the polarization state of light. Fig. 1(b) shows the simulated coincidence rate as the waveplate rotates for input Bell states |ϕ<sup>+</sup>〉 and |ϕ<sup>−</sup>〉. By capturing the coincidences variations as a Fourier series through a single rotating element and fixed polarizer, we simplify the tomography process, providing an accurate, and simple approach suitable for scalable quantum systems.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE) , 2025.
National Category
Atom and Molecular Physics and Optics Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-370852DOI: 10.1109/CLEO/EUROPE-EQEC65582.2025.11110136Scopus ID: 2-s2.0-105016176891OAI: oai:DiVA.org:kth-370852DiVA, id: diva2:2002887
Conference
2025 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2025, Munich, Germany, Jun 23 2025 - Jun 27 2025
Note

Part of ISBN 9798331512521

QC 20251002

Available from: 2025-10-02 Created: 2025-10-02 Last updated: 2025-11-11Bibliographically approved

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Brosseau, PierreAlqedra, MohammedZwiller, Val

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