Coherent control of population transfer between vibrational states in an optical lattice via two-path quantum interference.
We demonstrate coherent control of population transfer between vibrational states in an optical lattice by using interference between a one-phonon transition at 2ω and a two-phonon transition at ω. The ω and 2ω transitions are driven by phase- and amplitude-modulation of the lattice laser beams, respectively. By varying the relative phase of these two pathways, we control the branching ratio between transitions to the first excited state and those to the higher states. Our best result shows a branching ratio of 17±2, which is the highest among coherent control experiments using analogous schemes. Such quantum control techniques may find broad application in suppressing leakage errors in a variety of quantum information architectures.
Centre for Quantum Information and Quantum Control and Institute for Optical Sciences, Department of Physics, University of Toronto, Toronto, Ontario, M5S 1A7, Canada.
Chao
C
Zhuang
Centre for Quantum Information and Quantum Control and Institute for Optical Sciences, Department of Physics, University of Toronto, Toronto, Ontario, M5S 1A7, Canada.
Christopher R
CR
Paul
Centre for Quantum Information and Quantum Control and Institute for Optical Sciences, Department of Physics, University of Toronto, Toronto, Ontario, M5S 1A7, Canada.
Xiaoxian
X
Liu
Centre for Quantum Information and Quantum Control and Institute for Optical Sciences, Department of Physics, University of Toronto, Toronto, Ontario, M5S 1A7, Canada.
Samansa
S
Maneshi
Centre for Quantum Information and Quantum Control and Institute for Optical Sciences, Department of Physics, University of Toronto, Toronto, Ontario, M5S 1A7, Canada.
Luciano S
LS
Cruz
Centre for Quantum Information and Quantum Control and Institute for Optical Sciences, Department of Physics, University of Toronto, Toronto, Ontario, M5S 1A7, Canada.
Aephraim M
AM
Steinberg