Adam Miranowicz (Adam Mickiewicz University, Poznań and RIKEN, Wako, Japan)

Squeezed states of light are a powerful resource in quantum technologies, with notable applications such as improved gravitational wave detection, as demonstrated in the advanced LIGO and Virgo experiments, and demonstrations of quantum computational advantage through boson sampling with squeezed light in the experiments conducted by the Hefei and Xanadu-NIST groups. Additionally, quantum technologies based on Schrödinger cat states have garnered significant theoretical and experimental interest, particularly in the context of quantum computing. I would like to discuss novel applications of cavity squeezing for exponentially enhancing light-matter interactions, pushing the boundaries from the strong to ultra-strong and deep-strong coupling regimes, as well as for exponentially improving qubit readout. These novel applications have primarily been developed theoretically at RIKEN. Our concept of enhancing light-matter interactions through squeezing has already been experimentally confirmed by the NIST group (Burd et al., Nature Phys., 2021) and the Sorbonne group (Villiers et al., PRX Quantum, 2024). Furthermore, I will discuss explorations of Kerr-nonlinearity-based methods for generating multi-component Schrödinger cat-like states and novel protocols for geometric quantum gates based on cat qubits. Coauthors: Wei Qin (1,3), Ye-Hong Chen (4), Anton Kockum (5), Karol Bartkiewicz (2), Salvatore Savasta (6), Ievgen Arkhipov (7), Jan Perina (7), and Franco Nori (1,8) 1. RIKEN, Wako-shi, Japan 2. Adam Mickiewicz University, Pozna´n, Poland 3. Tianjin University, Tianjin, China 4. Fuzhou University, Fuzhou, China 5. Chalmers University of Tech., Sweden 6. Universita di Messina, Italy 7. Palacký University, Olomouc, Czech Republic 8. University of Michigan, Ann Arbor, USA