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장소 #1323 (E6-2, 1st fl.) 
일시 April 11 (Wed), 4:00pm 
연사 Dr. Young-Sik Ra 

Physics Seminar


Non-Gaussian states of multimode light generated via hybrid quantum information processing


Dr. Young-Sik Ra

Laboratoire Kastler Brossel, Paris, France


April 11 (Wed), 4:00pm

#1323 (E6-2, 1st fl.)




Optical quantum information processing can be classified into two categories depending on the way of encoding quantum information on light: one harnesses the particle nature (photon)−called discrete-variable approach−, and the other exploits the wave nature (electric field)−called continuous-variable approach. Basic nonclassical lights for the two are single photon and squeezed vacuum, respectively. Recently, a new field of study is emerging, called hybrid quantum information processing that combines the two conventional approaches to complement each other.


In this seminar, I will present generation of non-Gaussian quantum states of multimode light based on the hybrid quantum information processing. Squeezed vacuum, which is employed in the continuous-variable approach, is a Gaussian state, which can be described by moments up to the second order (i.e. variance). However, it has limitations on quantum computing and quantum communication, while single-photon subtraction used in the discrete-variable approach can provide non-Gaussian characteristics. We have implemented a single-photon subtractor compatible with multimode squeezed vacuum and generated non-Gaussian multimode quantum states. The novel quantum states of light will find applications in various quantum technologies such as distillation of entangled states, universal quantum computing, and quantum metrology.


Contact: Yongseop Kang, Administration Team (T.2599)


Department of Physics

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155 2010/02/08-05/03  E6, 1501  최인수교수(서울대) 외  Physics Ciolloquium : 2010 Spring file
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