Title: “Teleportation of high-dimensional spatial information with a nonlinear detector”

Abstract:

Teleportation allows information exchange between two distant parties, facilitated by the sharing of entangled photons and a classical communication channel. With increased dimensionality, teleportation offers the promise of higher information capacity and improved resilience to noise, but is limited by the commonly used linear optical detection schemes that require the number of ancillary photons to grow with dimension. Here, we present an scheme to overcome this restriction and experimentally realise the teleportation of high-dimensional spatial information with a single entangled pair and a nonlinear spatial mode detector. We will show the demonstration of a 15 dimensional quantum transport channel for unknown photonic spatial modes, exceeding the classical limit and advancing the state-of-the-art of two spatial modes for qubit teleportation, and qutrit teleportation with path entanglement. Our proof-of-principle experiment offers the first spatial basis and dimension independent approach, which we demonstrate by transferring information encoded into orbital angular momentum, Hermite-Gaussian and arbitrary spatial mode superpositions, all with high fidelity and similarity, and without prior knowledge of the state to be sent. While our teleportation process is stimulated with a coherent source, it could in future be performed with a single photon input by advances in nonlinear optics without changing its single entangled pair configuration, offering the first versatile and scalable approach for high-dimensional teleportation of quantum information.

Biography:

Adam Vallés received his BSc in telecom engineering from the Universitat Politècnica de Catalunya (UPC) in 2011, his MSc in photonics from the Institut de Ciències Fotòniques (ICFO) in 2012, and his PhD in photonics also from ICFO in 2017, where he had the opportunity of designing and implementing quantum optics-based experiments. He was then awarded a Claude Leon Foundation postdoctoral fellowship to work in the Structured Light Lab from the University of the Witwatersrand, South Africa. He also worked as Assistant Professor at Chiba University, Japan, devising novel imaging techniques for the terahertz region. After over 4 years of postdoctoral experience supervising students and leading international projects in collaboration with Heriot-Watt, Naples, Tohoku and Harvard universities, he joined the Optoelectronics group in ICFO where he is currently working as a Research Fellow. He is also lecturing in different BSc courses in Universitat Autònoma de Barcelona (UAB) and in the MSc in photonics coordinated by UPC, UAB, ICFO and also Universitat de Barcelona (UB). His research interests are mainly focused on high-dimensional quantum communication and quantum imaging.

Instructions for students: students don’t need to prepare anything in advance, but two papers related to the topic are given as reference

- B. Sephton, A. Vallés, I. Nape, M. A. Cox, F. Steinlechner, T. Konrad, J. P Torres, F. S. Roux, and A. Forbes “Quantum transport of high-dimensional spatial information with a nonlinear detector,” Nat. Commun. 14, 8243 (2023).

- B. Sephton, A. Vallés, F. Steinlechner, T. Konrad, J. P Torres, F. S. Roux, and A. Forbes “Spatial mode detection by frequency upconversion,” Opt. Lett. 44, 586 (2019).