LPHYS'26
34th Annual International Laser Physics Conference

Multiparameter Heisenberg Scaling in Arbitrary Optical Networks with Limited Squeezed Resources

Invited Talk

V Tamma1

1 School of Math and Physics, University of Portsmouth, Portsmouth, UK

Seminar: S6 — Physics of Cold Trapped Atoms and Ions

Thursday, 9 July 2026 · 16:00 – 16:30

Abstract

Simultaneous estimation of multiple parameters is a central task in quantum metrology, distributed sensing, and the calibration of large photonic interferometers.

I will show novel quantum interference techniques with squeezed light for the measurements with Heisenberg-scaling sensitivity of multiple parameters in linear optical networks [1, 2, 3, 4]. I will also demonstrate the Heisenberg-scaling characterization of an arbitrary two-channel network via two-port homodyne detection and two-mode squeezed sources [5, 6]. I will finally show the geometric bounds on multiparameter Heisenberg scaling for arbitrary M-mode networks with limited squeezed resources [7].

Applications can range from environmental sensing to high-precision biomedical imaging, characterization of nanomaterials, navigation, gravity tests and quantum networks of high-precision clocks.

References

  1. A Rai, D Triggiani, P Facchi and V Tamma, arXiv: 2603.20139 (2026)
  2. A Rai, D Triggiani, P Facchi and V Tamma, Phys. Rev. A 112, 062401 (2025)
  3. A Rai, D Triggiani, P Facchi and V Tamma, Eur. Phys. J. Plus 140, 858 (2025)
  4. A Rai, D Triggiani, P Facchi and V. Tamma, Phys. Rev. A 111, 062408 (2025)
  5. A Rai, P Facchi and V. Tamma, arXiv: 2603.20139 (2026)
  6. A Rai, P Facchi and V. Tamma, Phys. Rev. Lett., in press
  7. A Rai, P Facchi and V. Tamma, to be published
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