All day
Place: Instituto de Física, UNAM (México)
Darrick Chang (ICFO)
"Quantum optics with atom arrays"
Abstract:
Quantum atom-light interfaces are being actively researched for their many potential applications within quantum science and technology. However, in many potential applications, dissipation remains too large for practical realization. The major source of dissipation in atom-light interfaces is unwanted scattering, where light input into an atomic ensemble excites the atoms and is subsequently re-emitted into other directions that cannot be efficiently collected. In conventional theories, this process is treated as being independent -- every atom is assumed to scatter light into unwanted directions at a fixed rate, which does not depend on the other atoms. Such an assumption ignores the wave interference of light emission and multiple scattering. In recent years, it has been realized that interference and multiple scattering are in fact powerful resources, particularly in arrays of atoms with sub-wavelength lattice constant where such effects are strongly enhanced. In this lecture, we introduce the field of "quantum optics with arrays." We discuss how arrays can enable the implementation of applications such as quantum memories and photon-photon gates, whose errors scale polynomially or exponentially better than what is predicted by conventional theories, by using destructive interference to suppress unwanted light scattering.
Bio:
Darrick Chang is an ICREA Research Professor at ICFO. He obtained his bachelor's degree in physics from Stanford University in 2001, and his PhD in physics from Harvard University in 2008. Subsequently, he held a prize postdoctoral fellowship at the California Institute of Technology. In 2011, Darrick joined ICFO as the leader of the Theoretical Quantum Nanophotonics group. He was awarded an ERC Starting Grant in 2015, and an ERC Consolidator Grant in 2021. He has been involved in many previous/current international projects, including as a PI and scientific coordinator of European FET-Open projects GRASP and DAALI, as a PI in the Quantum Flagship project QIA, QuantERA project QuSiED, and EIC Pathfinder project PANDA.
His group focuses on developing novel techniques to manipulate quantum interactions between light and matter, advancing theoretical tools to understand these phenomena, and proposing novel applications for such systems. The group also collaborates with leading experimental groups worldwide to bring their ideas toward realization.
All day
Place: Instituto de Física, UNAM (México)
Darrick Chang (ICFO)
"Quantum optics with atom arrays"
Abstract:
Quantum atom-light interfaces are being actively researched for their many potential applications within quantum science and technology. However, in many potential applications, dissipation remains too large for practical realization. The major source of dissipation in atom-light interfaces is unwanted scattering, where light input into an atomic ensemble excites the atoms and is subsequently re-emitted into other directions that cannot be efficiently collected. In conventional theories, this process is treated as being independent -- every atom is assumed to scatter light into unwanted directions at a fixed rate, which does not depend on the other atoms. Such an assumption ignores the wave interference of light emission and multiple scattering. In recent years, it has been realized that interference and multiple scattering are in fact powerful resources, particularly in arrays of atoms with sub-wavelength lattice constant where such effects are strongly enhanced. In this lecture, we introduce the field of "quantum optics with arrays." We discuss how arrays can enable the implementation of applications such as quantum memories and photon-photon gates, whose errors scale polynomially or exponentially better than what is predicted by conventional theories, by using destructive interference to suppress unwanted light scattering.
Bio:
Darrick Chang is an ICREA Research Professor at ICFO. He obtained his bachelor's degree in physics from Stanford University in 2001, and his PhD in physics from Harvard University in 2008. Subsequently, he held a prize postdoctoral fellowship at the California Institute of Technology. In 2011, Darrick joined ICFO as the leader of the Theoretical Quantum Nanophotonics group. He was awarded an ERC Starting Grant in 2015, and an ERC Consolidator Grant in 2021. He has been involved in many previous/current international projects, including as a PI and scientific coordinator of European FET-Open projects GRASP and DAALI, as a PI in the Quantum Flagship project QIA, QuantERA project QuSiED, and EIC Pathfinder project PANDA.
His group focuses on developing novel techniques to manipulate quantum interactions between light and matter, advancing theoretical tools to understand these phenomena, and proposing novel applications for such systems. The group also collaborates with leading experimental groups worldwide to bring their ideas toward realization.