Robust two-state swap by stimulated Raman adiabatic passage

Abstract

Efficient initialization and manipulation of quantum states is important for numerous applications and it usually requires the ability to perform high fidelity and robust swapping of the populations of quantum states. Stimulated Raman adiabatic passage (STIRAP) has been known to perform efficient and robust inversion of the ground states populations of a three-level system. However, its performance is sensitive to the initial state of the system. In this contribution we demonstrate that a slight modification of STIRAP, where we introduce a non-zero single-photon detuning, allows for efficient and robust population swapping for any initial state. The results of our work could be useful for efficient and robust state preparation, dynamical decoupling and design of quantum gates in ground state qubits via two-photon interactions.

Adiabatically Manipulated Systems Interacting with Spin Baths beyond the Rotating Wave Approximation

“…The STIRAP technique is still extensively investigated [13][14][15][16][17][18] and has been exploited in different physical contexts ranging from cold gases [19][20][21] to condensed matter [22][23][24][25][26][27][28], plasmonic systems [29,30], superconducting devices [31][32][33], trapped ions [34,35] and optomechanical systems [36]. Recently, in order to improve the original technique by shortening the population transfer process, modifications to the original scheme including shortcuts to adiabaticity have been proposed [37][38][39][40][41][42].…”

Adiabatic Manipulation of a System Interacting with a Spin Bath

“…The specific features of such pulses should ensure the validity of the adiabatic approximation and make an eigenstate of the time-dependent Hamiltonian coincide with the initial state of the system at the beginning of the process and with the target state at the end of the application of the pulses. This technique is still extensively studied [13][14][15], and improvements of the original scheme have been proposed, for example, including shortcuts to adiabaticity, which allow for the shortening of the duration of the process [16][17][18][19][20], though this modified technique has the disadvantage of requiring a more complicated apparatus to implement additional Hamiltonian terms necessary for the shortcuts.…”