Although photons typically couple weakly to atoms, most photonic-based quantum technologies require strong light-matter interactions to have useful applications. In the last years, there has been intense research to find new theoretical and experimental avenues to enhance this interaction, leading to new platforms such as superconducting circuits, photonic crystals or atomic arrays. This development of photonic technologies has led to numerous platforms to discover new and exotic phenomena. In our group, we work at the frontiers of this field exploring burgeoning research lines in this context:
Topological Quantum Photonics
Topological phases of matter are characterized by exotic boundary physics, namely by the existence of protected modes at the edge of the system that are immune to local perturbations such as disorder or defects. In recent years, research in topological phases in photonic systems has led to the discovery of several unconventional quantum optical phenomena with promising applications.
Sending multi-photon wave-packets and analyzing the associated reflection and transmission properties is an interesting pathway for characterizing a certain system. Several theoretical and experimental efforts are being made to study the physics of scattered photons.
In quantum technology platforms, it is a common issue to have signals that are too weak to be detected, which can lead to poor fidelities. It is of fundamental importance to develop quantum amplification protocols that can render these signals more easily detectable.
Generation of Multi-Photon States
Engineering and control of quantum states of light are central in photonic quantum technologies. Even though the generation of single-mode one-photon states is achievable in various platforms, intense research on the multi-photon case is still ongoing.
Selected Group Publications
- Bello, M., Platero, G., Cirac, J. I., & González-Tudela, A. (2019). Unconventional quantum optics in topological waveguide QED. Science advances, 5(7), eaaw0297.
- Ramos, T., García-Ripoll, J. J., & Porras, D. (2021). Topological input-output theory for directional amplification. Physical Review A, 103(3), 033513.
- Ramos, T., & García-Ripoll, J. J. (2017). Multiphoton scattering tomography with coherent states. Physical review letters, 119(15), 153601.
- Paulisch, V., Kimble, H. J., Cirac, J. I., & González-Tudela, A. (2018). Generation of single-and two-mode multiphoton states in waveguide QED. Physical Review A, 97(5), 053831.