arXiv subjects

Shumpei Masuda

Publications and source records attributed to Shumpei Masuda.

39 records · Page 3Linked to original sources

arXiv2012

Acceleration of adiabatic transport of interacting particles and rapid manipulations of dilute Bose gas in ground state

We show a method to accelerate quantum adiabatic transport of identical spinless particles interacting with each other by developing the preceding fast-forward scaling theory formed for one-particle systems [Masuda and Nakamura, {\it Proc. R. Soc.} A {\bf 466}, 1135 (2010)]. We derive a driving potential which accelerates adiabatic dynamics of quantum systems composed of identical particles in order to obtain the final adiabatic states in any desired short time. We also exhibit an ideal rapid manipulation of dilute Bose gas in the ground state without energy excitation by using the fast-forward scaling theory.

cond-mat.mes-hall↗

arXiv2010

Fast-forward of quantum adiabatic dynamics in electro-magnetic field

We show a method to accelerate quantum adiabatic dynamics of wavefunctions under electro-magnetic field by developing the previous theory (Masuda & Nakamura 2008 and 2010). Firstly we investigate the orbital dynamics of a charged particle. We derive the driving field which accelerates quantum adiabatic dynamics in order to obtain the final adiabatic states except for the spatially uniform phase such as the adiabatic phase in any desired short time. Fast-forward of adiabatic squeezing and transport in the electro-magnetic field is exhibited. Secondly we investigate spin dynamics under the magnetic field, showing the fast-forward of adiabatic spin inversion and of adiabatic dynamics in Landau-Zener model. The connection of the present framework with Kato-Berry's transitionless quantum driving is elucidated in Appendix.

cond-mat.mes-hall↗

arXiv2009

Fast-forward of adiabatic dynamics in quantum mechanics

We propose a way to accelerate adiabatic dynamics of wave functions in quantum mechanics to obtain a final adiabatic state except for the spatially uniform phase in any desired short time. We develop the previous theory of fast-forward (Masuda & Nakamura 2008) so as to derive a driving potential for the fast-forward of the adiabatic dynamics. A typical example is the fast-forward of adiabatic transport of a wave function which is the ideal transport in the sense that a stationary wave function is transported to an aimed position in any desired short time without leaving any disturbance at the final time of the fast-forward. As other important examples we show accelerated manipulations of wave functions such as their splitting and squeezing. The theory is also applicable to macroscopic quantum mechanics described by the nonlinear Schroedinger equation.

cond-mat.mes-hall↗