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Quantum Entanglement Preserved All Photonic Switch

Jiapeng Zhao, Lucas Wang, Amir Minoofar, Tin Komljenović, Galan Moody, Reza Nejabati

Published Jan 1, 2026• 0 citations
Publisher

Abstract

We propose and develop a modularized, non-blocking quantum switch with all-to-all connectivity on a silicon nitride platform. This switch enables low-loss, dynamic routing of the polarization and path entanglement without affecting the fidelity.
DOI
10.1364/cleo_fs.2026.fm2a.5

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Future quantum optical networks will require the ability to route entangled photons at high speeds, with minimal loss and added in-band noise, and---most importantly---without disturbing the photons' quantum state. Here we present an all-optical switch which fulfills these requirements and characterize its performance at the single photon level. It exhibits a 200-ps switching window, 120:1 contrast, 1.5-dB loss, and induces no measurable degradation in the switched photons' entangled-state fidelity (< 0.002). As a proof-of-principle demonstration of its capability, we use the switch to demultiplex a single quantum channel from a dual-channel, time-division-multiplexed entangled photon stream. Furthermore, because this type of switch couples the temporal and spatial degrees of freedom, it provides an important new tool with which to encode multiple-qubit quantum states on a single photon.