scholarly journals Superadiabatic population transfer in a three-level superconducting circuit

2019 ◽  
Vol 5 (2) ◽  
pp. eaau5999 ◽  
Author(s):  
Antti Vepsäläinen ◽  
Sergey Danilin ◽  
Gheorghe Sorin Paraoanu
Keyword(s):  
Excited State ◽  
Ground State ◽  
Microwave Pulse ◽  
Quantum Information Processing ◽  
Quantum Circuit ◽  
Population Transfer ◽  
Adiabatic Passage ◽  
Two Photon ◽  
Superconducting Circuit ◽  
Stimulated Raman Adiabatic Passage

Adiabatic manipulation of the quantum state is an essential tool in modern quantum information processing. Here, we demonstrate the speedup of the adiabatic population transfer in a three-level superconducting transmon circuit by suppressing the spurious nonadiabatic excitations with an additional two-photon microwave pulse. We apply this superadiabatic method to the stimulated Raman adiabatic passage, realizing fast and robust population transfer from the ground state to the second excited state of the quantum circuit.

Population Transfer in Multilevel System via Modified Stimulated Raman Adiabatic Passage

2014 ◽  
Vol 577 ◽  
pp. 112-115
Author(s):  
Xiao Qin Shu ◽  
Chi Deng ◽  
Ye Kuang ◽  
Jian Hui Yang ◽  
Yi Ding Liu
Keyword(s):  
Spontaneous Emission ◽  
Intermediate Level ◽  
Level Population ◽  
Population Transfer ◽  
Multilevel System ◽  
Adiabatic Passage ◽  
Stimulated Raman Adiabatic Passage ◽  
Novel Method ◽  
Stimulated Raman

During the STIRAP process, the intermediate levels will have notable population which is detrimental if these levels could decay to other levels through spontaneous emission. Here, we propose a novel method which could reduce the intermediate level population during the STIRAP process. A complete population transfer could be achieved in this modified STIRAP even if the intermediate level could decay to other levels.

On the optimality of optical pumping for a closed Λ-system with large decay rates of the intermediate excited state

2021 ◽  
Author(s):  
Dionisis Stefanatos ◽  
Emmanuel Paspalakis
Keyword(s):  
Optimal Control ◽  
Excited State ◽  
Decay Rate ◽  
Optimal Control Theory ◽  
Optical Pumping ◽  
Quantum Information Processing ◽  
Decay Rates ◽  
Population Transfer ◽  
Initial State ◽  
Weakly Coupled

Abstract We use optimal control theory to show that for a closed Λ-system where the excited intermediate level decays to the lower levels with a common large rate, the optimal scheme for population transfer between the lower levels is actually optical pumping. In order to obtain this result we exploit the large decay rate to eliminate adiabatically the weakly coupled excited state, then perform a transformation to the basis comprised of the dark and bright states, and finally apply optimal control to this transformed system. Subsequently, we confirm the optimality of the optical pumping scheme for the original closed Λ-system using numerical optimal control. We also demonstrate numerically that optical pumping remains optimal when the decay rate to the target state is larger than that to the initial state or the two rates are not very different from each other. The present work is expected to find application in various tasks of quantum information processing, where such systems are encountered

Population transfer of a NaH molecule via stimulated Raman adiabatic passage

Laser Physics ◽  
2016 ◽  
Vol 26 (9) ◽  
pp. 096002 ◽  
Author(s):  
Jing-Bo Zai ◽  
Wei-Shen Zhan ◽  
Shuo Wang ◽  
Hai-Ping Dang ◽  
Xiao Han
Keyword(s):  
Population Transfer ◽  
Adiabatic Passage ◽  
Stimulated Raman Adiabatic Passage ◽  
Stimulated Raman

scholarly journals Protecting and accelerating adiabatic passage with time-delayed pulse sequences

2016 ◽  
Vol 18 (19) ◽  
pp. 13443-13448 ◽  
Author(s):  
Pablo Sampedro ◽  
Bo Y. Chang ◽  
Ignacio R. Sola
Keyword(s):  
Wave Packet ◽  
Computer Simulations ◽  
Ground State ◽  
Pulse Sequences ◽  
Photon Absorption ◽  
Rabi Oscillations ◽  
Adiabatic Passage ◽  
Two Photon Absorption ◽  
State Time ◽  
Two Photon

We study non-resonant two-photon absorption in the B band of Na2 with femtosecond pulses. The computer simulations show attenuated Rabi oscillations using coincident pulses that can be overcome by initially preparing a wave packet in the ground state. Time-delayed pulse sequences intrinsically protect the adiabatic passage of population, but the process can be accelerated starting with the packet.

Coherent population transfer in Rydberg potassium atom via stimulated Raman adiabatic passage

2005 ◽  
Vol 14 (4) ◽  
pp. 720-724 ◽  
Author(s):  
Zhang Xian-Zhou ◽  
Han Hui-Li ◽  
Han Hong-Pei ◽  
Fan Xiao-Wei
Keyword(s):  
Potassium Atom ◽  
Population Transfer ◽  
Adiabatic Passage ◽  
Stimulated Raman Adiabatic Passage ◽  
Stimulated Raman

scholarly journals Production of Ultracold87Rb133Cs in the Absolute Ground State: Complete Characterisation of the Stimulated Raman Adiabatic Passage Transfer

ChemPhysChem ◽  
2016 ◽  
Vol 17 (22) ◽  
pp. 3811-3817 ◽  
Author(s):  
Peter K. Molony ◽  
Philip D. Gregory ◽  
Avinash Kumar ◽  
C. Ruth Le Sueur ◽  
Jeremy M. Hutson ◽  
...  
Keyword(s):  
Ground State ◽  
Adiabatic Passage ◽  
Stimulated Raman Adiabatic Passage ◽  
The Absolute ◽  
Complete Characterisation ◽  
Stimulated Raman

ELECTRON CORRELATION AND PHOTO PHYSICS OF PHENYL SUBSTITUTED POLYACETYLENES

2001 ◽  
Vol 15 (19n20) ◽  
pp. 2793-2798 ◽  
Author(s):  
HARANATH GHOSH ◽  
S. MAZUMDAR ◽  
Alok SHUKLA
Keyword(s):  
Excited State ◽  
Electron Correlation ◽  
Ground State ◽  
Transverse Direction ◽  
Longitudinal Direction ◽  
High Energy ◽  
Electron Interaction ◽  
Many Body ◽  
Photon State ◽  
Two Photon

We investigate theoretically photoluminescence (PL) properties of mono and di-phenyl substituted trans-polyacetylene (t-PA), namely, poly-phenylacetylene (PPA) and poly-diphenylacetylene (PDPA), respectively. PL is a consequence of the occurrence of the two-photon state ( 2Ag ) above the optically excited state ( 1Bu ). Usually, electron correlation leads to confinement of 1Bu as well as the ground state. We show, in contrast, that in phenyl-substituted polyacetylenes electron–electron interactions cause enhanced delocalization of quasiparticles in the optically excited state from the backbone polyene chain into the phenyl groups. This coulomb enhanced delocalization in the transverse direction leads to confinement in the longitudinal direction and causes crossover between the 1Bu and 2Ag . We further show that in the absence of electron repulsion the low energy absorption is x-polarized whereas the high energy absorpion is predominantly y-polarized. In contrast, in presence of many body electron interaction both of them (low and high energy absorptions) are x-polarized. Thus photophysics of PPA/PDPA etc. are consequences of true many body effects.

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