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Variational and diffusion quantum Monte Carlo (VMC and DMC) calculations ofthe properties of the zero-temperature fermionic gas at unitarity are reported.The ratio of the energy of the interacting to the non-interacting gas for asystem of 128 particles is calculated to be 0.4517(3) in VMC and 0.4339(1) inthe more accurate DMC method. The spherically-averaged pair-correlationfunctions, momentum densities, and one-body density matrices are very similarin VMC and DMC, but the two-body density matrices and condensate fractions showsome differences. Our best estimate of the condensate fraction of 0.51 is alittle smaller than values from other quantum Monte Carlo calculations.

Ultracold atoms at unitarity within quantum Monte Carlo