Related papers: Tracking the Evolution of Near-Field Photonic Qubits into High-Dimensional Qudits via State Tomography

Tracking the Evolution of Near-Field Photonic Qubits into High-Dimensional Qudits via State Tomography

URL: http://arxiv.org/abs/2504.20590v1
Date: Tue, 29 Apr 2025 09:42:01 GMT
Title: Tracking the Evolution of Near-Field Photonic Qubits into High-Dimensional Qudits via State Tomography
Authors: Amit Kam, Shai Tsesses, Lior Fridman, Yigal Ilin, Amir Sivan, Guy Sayer, Kobi Cohen, Amit Shaham, Liat Nemirovsky-Levy, Larisa Popilevsky, Meir Orenstein, Mordechai Segev, Guy Bartal,
Abstract summary: nanophotonic platforms can transfer information from the traditional degrees of freedom (DoFs) to the DoFs of the nanophotonic platform.<n>Recent experiments have utilized the total angular momentum (TAM) of a photon as a unique means to produce entangled qubits in nanophotonic platforms.<n>Here, we reveal the evolution of quantum information in heralded single photons as they couple into and out of the near-field of a nanophotonic system.
Score: 5.548707143541636
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Quantum nanophotonics offers essential tools and technologies for controlling quantum states, while maintaining a miniature form factor and high scalability. For example, nanophotonic platforms can transfer information from the traditional degrees of freedom (DoFs), such as spin angular momentum (SAM) and orbital angular momentum (OAM), to the DoFs of the nanophotonic platform - and back, opening new directions for quantum information processing. Recent experiments have utilized the total angular momentum (TAM) of a photon as a unique means to produce entangled qubits in nanophotonic platforms. Yet, the process of transferring the information between the free-space DoFs and the TAM was never investigated, and its implications are still unknown. Here, we reveal the evolution of quantum information in heralded single photons as they couple into and out of the near-field of a nanophotonic system. Through quantum state tomography, we discover that the TAM qubit in the near-field becomes a free-space qudit entangled in the photonic SAM and OAM. The extracted density matrix and Wigner function in free-space indicate state preparation fidelity above 97%. The concepts described here bring new concepts and methodologies in developing high-dimensional quantum circuitry on a chip.

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