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Program with Abstracts > WednesdayExploiting quantum photonics for quantum computing and quantum machine learning Philip Walther (Vienna University -- invited) — We 9:00-10:00 After providing a brief overview of recent advancements in the generation and processing of multi-photon states, I will show the potential of photonic quantum machine learning. After presenting a quantum-enhanced reinforcement learning using a tunable integrated processor, I will discuss our development of a so-called quantum memristor for single photons. These devices, which can mimic the behavior of neurons and synapses, hold great promise for the realization of quantum neural networks. I will also present how photonic processors can implementing quantum-enhanced kernels for machine learning tasks. At the end I will change topic by briefly discussing the flexibility of photonic systems for tasks that require non-standard quantum computer architectures. Exponentially Enhanced Scheme for the Heralded Qudit GHZ State in Linear Optics Seungbeom Chin et al. (Okinawa Inst. Sc. and Tech.; Korea Inst. Sc. and Tech.) — We 10:00-10:30 High-dimensional multipartite entanglement plays a crucial role in quantum information science. However, existing schemes for generating such entanglement become complex and costly as the dimension of quantum units increases. In this work, we overcome the limitation by proposing a significantly enhanced linear optical heralded scheme that generates the d-level N-partite GHZ state with single-photon sources and linear operations. We design our scheme based on the graph picture of linear quantum networks, introduced in Quantum 5,611 (2021) and npj Quantum Information 10(1), 67 (2024). Our scheme requires dN photons, which is the minimal required photon number, with substantially improved success probability from previous schemes. It employs linear optical logic gates compatible with any qudit encoding system and can generate generalized GHZ states with installments of beamsplitters. With efficient generations of high-dimensional resource states, our work opens avenues for further exploration in high-dimensional quantum information processing. This talk is based on Physical Review Letters 133 (25), 253601 (2024).
General approach to quantum information with quantum optics from a superselection rule perspective Perola Milman et al. (U. Paris Diderot) — We 11:00-11:30 We show that explicitly incorporating a phase reference into the quantum state of the field permits its unambiguous definition and the evaluation of its resourcefulness in quantum information. This approach, in particular, allows for the identification of non-classical features of the field through a unified physical and computational criterion based on particle entanglement in first quantization. It also provides a general framework for describing arbitrary bosonic quantum information encodings, along with the necessary and sufficient Gaussian and non-Gaussian resources they require.
Minimizing resource overhead in fusion-based quantum computation using hybrid spin-photon devices Shane Mansfield (Quandela) — We 11:30-12:00 We present three schemes for constructing a (2,2)-Shor-encoded 6-ring photonic resource state for fusion-based quantum computing, each relying on a different type of photon source. We benchmark these architectures by analyzing their ability to achieve the best-known loss tolerance threshold for fusion-based quantum computation using the target resource state. More precisely, we estimate their minimum hardware requirements for fault-tolerant quantum computation in terms of the number of photon sources to achieve on-demand generation of resource states with a desired generation period. Notably, we find that a group of 12 deterministic single-photon sources containing a single matter qubit degree of freedom can produce the target resource state near-deterministically by exploiting entangling gates that are repeated until success. The approach is fully modular, eliminates the need for lossy large-scale multiplexing, and reduces the overhead for resource-state generation by several orders of magnitude compared to architectures using heralded single-photon sources and probabilistic linear-optical entangling gates. Our work shows that the use of deterministic single-photon sources embedding a qubit substantially shortens the path toward fault-tolerant photonic quantum computation.
Roundtable featuring session speakers, Paris quantum company Quandela — We 12:00-12:30
Free afternoon for - scientific discussions: the amphitheater remains available - company lab visits: upon registration & screening
Cocktail dinner for all conference participants — We 18:30-20:30
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