SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 24: Quantum Networks I (joint session QI/Q)
Q 24.6: Vortrag
Mittwoch, 8. März 2023, 12:30–12:45, B305
Generation of multidimensional entanglement in quantum optical systems — •Felix Twisden-Peareth, Jan Sperling, and Polina Sharapova — Paderborn University, Warburger Str. 100 | 33098 Paderborn
Multidimensional entanglement is a key source for many quantum applications, such as quantum computing, quantum communication and quantum simulation [1].
In this work, we investigate a four-channeled quantum optical system, which is driven by two spontaneous parametric down-conversion (SPDC) sources (each emitting two photons), in order to find configurations that generate maximal entanglement.
The entanglement is quantified by the Schmidt number K = Tr[ρr2]−1, which is applicable to both pure and mixed states [2]. In our system, to calculate the Schmidt number, we provide reductions regarding both frequencies and spatial channels. In order to affect the entanglement, the photons in the system are manipulated regarding their polarization
and relative position by introducing a time delay. It was found that Schmidt numbers equal to the dimensionality of the system can be generated. For this, the generation of a coherent superposition of different polarizations is provided, which is followed by a temporal separation of its parts. All results are calculated for the material system LiNbO3.
[1] J. Wang, et al., Multidimensional quantum entanglementwith large-scale integrated optics, Science 360, 285*291 (2018).
[2] B. M. Terhal and P. Horodecki, Schmidt number for density matrices, Physical Review A 61, 040301 (2000).