Quantum state tomography of ultrafast optical pulses at telecom wavelength by broadband balanced homodyne detection

Terence Blésin, Rei Matsushita, Kouichi Akahane, Junko Hayase

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The efficient transfer of a quantum state from photons to matter qubits in order to momentarily store information has become a central problem in quantum information processing. A quantum memory turns out to be an essential tool to achieve advanced technologies such as quantum networks, quantum repeaters, deterministic single photon sources or linear optics quantum computers. The realization of a quantum interface has been investigated in various forms, among which one can find solid-state atomic ensembles, color centers in crystal lattices, cold atomic gases, optical phonons in diamond and many others. Here we focus on a broadband quantum interface for high repetition rate (76 MHz) ultrafast optical pulses (250 fs) at telecommunication wavelength (1530 nm) based on the photon echo process occurring in semiconductor quantum dots. We evaluated the quantum state of photonic qubits in order to characterize the impact of the storage on the transmitted signal. Homodyne traces corresponding to projections of the Wigner function of the signal on rotated quadrature components were obtained using broadband balanced homodyne detection, i.e. mixing the ultrafast optical pulses to analyze with a high repetition rate pulsed local oscillator. The reconstruction of the Wigner function from the homodyne traces was performed using three algorithms: The inverse Radon transform, the minimax adaptive reconstruction and the maximum likelihood estimation. The three methods lead to similar results, concluding that for an input pulse in a coherent state, the reemitted photon echo is also in a coherent state.

Original languageEnglish
Title of host publicationAdvances in Photonics of Quantum Computing, Memory, and Communication XII
EditorsZameer Ul Hasan, Philip R. Hemmer, Alan L. Migdall
PublisherSPIE
ISBN (Electronic)9781510625082
DOIs
Publication statusPublished - 2019 Jan 1
EventAdvances in Photonics of Quantum Computing, Memory, and Communication XII 2019 - San Francisco, United States
Duration: 2019 Feb 52019 Feb 7

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10933
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceAdvances in Photonics of Quantum Computing, Memory, and Communication XII 2019
CountryUnited States
CitySan Francisco
Period19/2/519/2/7

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Keywords

  • broadband quantum interface
  • inverse Radon transform
  • maximum likelihood estimation
  • minimax algorithm
  • photon echo
  • Quantum state tomography
  • telecommunication wavelength
  • ultrafast optical pulses

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Blésin, T., Matsushita, R., Akahane, K., & Hayase, J. (2019). Quantum state tomography of ultrafast optical pulses at telecom wavelength by broadband balanced homodyne detection. In Z. Ul Hasan, P. R. Hemmer, & A. L. Migdall (Eds.), Advances in Photonics of Quantum Computing, Memory, and Communication XII [109330V] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10933). SPIE. https://doi.org/10.1117/12.2507827