内山研究室

Research Theme

Dynamics of Open Quantum Systems

Developments of experimental technology provide us new possibilities to use principles of quantum mechanics for future technologies such as information processing and transport in microscopic level. The developments enable us to control microscopic entities, for example, electrons, atomic nucleus, ions, and photons. But, it is impossible to isolate these entities. These are inevitably affected by their surrounding environments, which are often treated as obstacles to realize quantum technologies. To overcome the difficulties, we need to evaluate the environmental effects from theoretical viewpoints. The theoretical model to include such effects is often termed as a quantum open system. In this laboratory, we struggle to evaluate the environmental effects as well as to propose a new way to adopt such effects on quantum information processing and quantum transport by studying quantum open systems. ( details...)

News

“Kick-off meeting for collaboration on open quantum systems”
was held at Univ. of Yamanashi. Abstracts
Program
timepresentortalk title
9:50 Opening address
10:00-10:30Kazuki Kanki
(Osaka Pref. Univ.)		PT-symmetry and its breaking through a nonhermitian degeneracy point in the Liouvillian dynamics
10:30-11:00Ken-ichi Noba
(Osaka Pref. Univ.)		Spatial distribution of asteroids at resonance point represented by solution of the eigenvalue problem of the Liouvillian
11:00-12:00Tomio Petrosky
(Univ. Texas)		Infinity vs. Semi-infinity: an unexpected non-analyticity in a universal Lorentzian line shape
12:00-14:00 Lunch
14:00-15:00Kazunari Hashimoto
(Univ. Yamanashi)		Complex spectrum of Liouvillian and transport process in one-dimensional quantum Lorentz gas
15:00-15:30 Coffee break
15:30-16:00Todd Tilma
(Titech)		Characterization of Qudit Entanglement Through the Visualization of Spin-Coherent-State Wigner Functions
16:00-16:30Satoshi Tanaka
(Osaka Pref. Univ.)		Photon at a distance correlated with vacuum Rabi oscillation in cavity exciton polariton
16:30-17:00Chikako Uchiyama
(Univ. Yamanashi)		Nonadiabatic effect on the quantum heat flux control
17:00 Closing address

Recent Presentations and Papers

Paper: "Energy backflow and non-Markovian dynamics"

G. Guarnieri, C. Uchiyama, and B. Vacchini, Phys. Rev. A 93, 012118

Oral Presentation in Conference: “International symposium on Foundation of Quantum Transport in Nano Science”

Paper: "Dynamics of quantum tomography in an open system"

Chikako Uchiyama, Physica Scripta, Vol.90 (2015), 074064.

Oral Presentation in Conference:“Quantum Control of Light and Matter (QCLM2015)”

OIST

Oral Presentation in Conference:“Nonequilibrium Phenomena in Novel Quantum States(YKIS2014)”

Yukawa Institute, Kyoto University　　Presented Slides

Oral Presentation in Conference:“46 Symposium on Mathematical Physics”

N. Copernics Univ., Poland