Realization of a multi-output quantum pulse gate for decoding high-dimensional temporal modes of single-photon states

• URL: http://arxiv.org/abs/2211.05693v1
• Date: Thu, 10 Nov 2022 16:56:20 GMT
• Title: Realization of a multi-output quantum pulse gate for decoding high-dimensional temporal modes of single-photon states
• Abstract summary: We experimentally demonstrate demultiplexing of five-dimensional TMs of single photons with an average fidelity of 0.96 $pm$ 0.01. This is achieved using a newly developed device, the multi-output quantum pulse gate (mQPG)
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Temporal modes (TMs) of photons provide an appealing high-dimensional encoding basis for quantum information. While techniques to generate TM states have been established, high-dimensional decoding of single-photon TMs remains an open challenge. In this work, we experimentally demonstrate demultiplexing of five-dimensional TMs of single photons with an average fidelity of 0.96 $\pm$ 0.01, characterized via measurement tomography. This is achieved using a newly developed device, the multi-output quantum pulse gate (mQPG). We demonstrate a proof-of-principle complete decoder based on the mQPG that operates on any basis from a set of 6 five-dimensional MUBs and is therefore suitable as a receiver for high-dimensional quantum key distribution. Furthermore, we confirm the high-quality operation of the mQPG by performing resource-efficient state tomography with an average fidelity of 0.98 $\pm$ 0.02.

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