Leader : Tanzilli Sébastien
Financial supports : ANR INQCA (project ANR-14-CE26-0038), Science & technology of nanoelectronics and nanophotonics components
Quantum information science is a research field that has established a new benchmark in communication and processing of information, thanks to augmented security protocols in data exchange and increased processing capabilities, both available at the quantum level. Being enlightened by numerous proofs-of-principle, this field is now ready to move on to next generation applications, such as quantum simulation, quantum chemistry, quantum cryptosystems, and quantum sensing. In this perspective, where scalability will actually rely on (re)-configurable and reliable quantum devices, integrated photonic circuits have a strong potential for implementing quantum information processing in optical systems. Integrated quantum photonics has recently emerged and has already proven its suitability for high-performance photon pair source realizations and basic quantum state simulation and manipulation. In this framework, INQCA is geared towards realizing and optimizing dense photonic quantum circuits on lithium niobate, offering increased complexity and flexibility in terms of number of computational channels, input states, and non-classical properties. The main objective of the project therefore lies in the integration of photon pair sources and functionalized arrays of coupled waveguides for demonstrating on-chip photonic quantum state preparation as well as advanced quantum functions and simulations, with unprecedented scalability and stability features.
On one hand, lithium niobate stands as a one of the most suitable medium for exploiting second-order nonlinear processes. It enables to produce, with high brightness, entangled photons and indistinguishable heralded single photons via spontaneous parametric down-conversion in waveguides integrated on periodically poled lithium niobate. It also permits on-demand (re)-configuration of the waveguide propagation properties via the electro-optical effect, allowing for instance routing single photons in a quantum bus fashion. In addition, such a platform offers the possibility to design and integrate arrays with a large number of waveguides and engineered mutual coupling constants. On the other hand, waveguide array circuitries stand as compact, flexible, and multiport tools for quantum propagation control and quantum manipulation of light in a scalable and integrated manner. Induced photonic lattices are suitable hosts for implementing quantum processes, such as quantum logic gates and optical analogues of the quantum properties of condensed matter systems.
By merging, on a single chip, the potential of waveguide arrays and high-brightness photon pair sources, we aim at developing integrated quantum devices showing tailored properties operated in both discrete and continuous variable regimes. More specifically, the main targets concern i) on-chip observation of quantum coalescence effects and quantum routing, ii) quantum operator emulation via adequate configuration of the waveguide mutual coupling constants, and iii) on-chip investigation of multi-photon entanglement preparation using photonic lattices. Photonic waveguide arrays can also support extended waves, travelling and interfering along the lattice. A more prospective approach will address the possibility of exploiting such extended waves to manipulate multi-photon and high-dimension quantum states of light.
The INQCA program represents a unique opportunity to gather recognized French experts in quantum optics and information, namely the Laboratoire de Physique de la Matière Condensée (LPMC) and the Laboratoire de Photonique et de Nanostructures (LPN), together with the mandatory technological expertise from the newly established Romanian RAMTECH Centre, to enter this worldwide competition at its earlier stage. Thanks to this competitive consortium, this project promises significant progress in the field of future quantum technologies and new perspectives in quantum optics.
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