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Multi-photon Bragg diffraction is a powerful method for fast, coherentmomentum transfer of atom waves. However, laser noise, Doppler detunings, andcloud expansion limit its efficiency in large momentum transfer (LMT) pulsesequences. We present simulation studies of robust Bragg pulses developedthrough numerical quantum optimal control. Optimized pulse performance undernoise and cloud inhomogeneities is analyzed and compared to analogous Gaussianand adiabatic rapid passage (ARP) pulses in simulated LMT Mach-Zehnderinterferometry sequences. The optimized pulses maintain robust populationtransfer and phase response over a broader range of noise, resulting insuperior contrast in LMT sequences with thermal atom clouds and intensityinhomogeneities. Large optimized LMT sequences use lower pulse area thanGaussian pulses, making them less susceptible to spontaneous emission loss. Theoptimized sequences maintain over five times better contrast with tens of$\hbar k$ momentum separation and offers more improvement with greater LMT.Such pulses could allow operation of Bragg atom interferometers withunprecedented sensitivity, improved contrast, and hotter atom sources.

Robust Atom Optics for Bragg Atom Interferometry