Our Work

Quantum States of Light at Thermal Equilibrium Can Enable High-precision Sensing Technology

Being able to achieve quantum perfect squeezed light at a finite light-matter coupling point can enable unprecedented applications in quantum optics and information technology

Title of the paper: Perfect Intrinsic Squeezing at the Superradiant Phase Transition Critical Point

Authors: Kenji Hayashida, Takuma Makihara, Nicolas Marquez Peraca, Diego Fallas Padilla, Han Pu, Junichiro Kono, and Motoaki Bamba

DOI:

Article Link: https://arxiv.org/abs/2009.02630View Infographic

Superradiant Phase Transition—Bridging Quantum Optics, Thermodynamics, and Condensed Matter Physics

In this study, “magnonic superradiant phase transition” was confirmed for the first time in a physical system, a step towards bridging quantum optics, thermodynamics, and solid-state physics.

Title of the paper: Magnonic Superradiant Phase Transition

Authors: Motoaki Bamba, Xinwei Li, Nicolas Marquez Peraca, and Junichiro Kono

Article Link: https://arxiv.org/abs/2007.13263

Unconventional Photon Blockade in a Weakly Coupled Cavity Pair

Unconventional photon blockade can also be observed in two coupled cavities, potentially advancing single-photon based quantum technologies used in communication and imaging.

Title of the paper: Origin of strong photon antibunching in weakly nonlinear photonic molecules

Authors: Motoaki Bamba, Atac Imamoğlu, Iacopo Carusotto, and Cristiano Ciuti

DOI: 10.1103/PhysRevA.83.021802

Article Link: https://doi.org/10.1103/PhysRevA.83.021802

Theory Meets Experiment: Newly Verified Strategy to Generate Highly Squeezed Light

When light intensity is high enough to couple with matter very strongly, a Bloch–Siegert shift occurs, negating the standard approximation that matter can be excited into a higher energy level by absorbing a photon but never by emitting a photon.

Title of the paper 1: Quantum Squeezing Generation versus Photon Localization in a Disordered Planar Microcavity

Authors: Motoaki Bamba,* Simon Pigeon, and Cristiano Ciuti

DOI: 10.1103/PhysRevA.83.021802

Title of the paper 2: Polariton-generated intensity squeezing in semiconductor micropillars

Authors: Thomas Boulier, Motoaki Bamba, Albert Amo, Claire Adrados, Lemaitre Lemaitre, Elisabeth Galopin, Isabelle Sagnes, Jacqueline Bloch, Cristiano Ciuti, Elisabeth Giacobino and Albert Bramati

DOI: 10.1038/ncomms4260

Article Link for Paper 2

https://doi.org/10.1038/ncomms4260

Coupling Light and Matter to Experimentally Observe an Elusive Effect

This study experimentally explores a mechanism by which strongly confined polaritons could generate “squeezed light,” a continuous stream of photons with highly suppressed quantum fluctuations.

Title of the paper: Origin of strong photon antibunching in weakly nonlinear photonic molecules

Authors: Xinwei Li, Motoaki Bamba , Qi Zhang, Saeed Fallahi, Geoff C. Gardner, Weilu Gao , Minhan Lou, Katsumasa Yoshioka, Michael J. Manfra and Junichiro Kono

DOI: 10.1038/s41566-018-0153-0

Article Link: https://doi.org/10.1038/s41566-018-0153-0

Elusive Electromagnetic Thermal Phenomenon Reveals Its Presence in a Superconducting Circuit

Superradiant phase transition at thermal equilibrium, a phenomenon that could revolutionize the way we generate and use energy to power our world, has finally been discovered in a type of superconducting circuit.

Title of the paper: Superradiant Phase Transition in a Superconducting Circuit in Thermal Equilibrium

Authors: Motoaki Bamba, Kunihiro Inomata, and Yasunobu Nakamura

DOI: 10.1103/PhysRevLett.117.173601

Article Link: https://doi.org/10.1103/PhysRevLett.117.173601