Abstract
Dr. Vladimir S. Malinovsky (MagiQ Technologies, Inc., New York)
Chirped pulse adiabatic control in quantum information and CARS microscopy
Common method to design quantum gates is based on the Rabi solution regime of a two-level system excited by external field. Various implementations of the gates based on Rabi solution employ relatively weak pulses that results in slow gate operations of order microseconds or slower. We discuss a proposal how to use strong femtosecond pulses in order to make quantum gates faster. We propose a scheme which provides a possibility to utilize strong pulses while keep all advantages of Rabi solution regime. We design fast gates (picosecond time scale) by choosing proper parameters of the chirped pulses in Raman excitation scheme as a way to control nonadiabatic terms and to satisfy the adiabaticity conditions. Controlling chirp rate we demonstrate Hadamard and phase-shift gates which in fact can be applied simultaneously to a set qubits in a quantum register. The proposed excitation scheme also can be used to implement CNOT gate. In addition we discuss interplay between individual addressing of qubits, ultrafast spectroscopy, CARS microscopy and coherent control. In particular, we demonstrate how to employ the adiabatic passage method in order to design a pulse sequence which creates a maximum of CARS coherence.