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By using the diffusion Monte Carlo method we calculate the one- and two-bodydensity matrix of an interacting Fermi gas at T=0 in the BCS-BEC crossover.Results for the momentum distribution of the atoms, as obtained from theFourier transform of the one-body density matrix, are reported as a function ofthe interaction strength. Off-diagonal long-range order in the system isinvestigated through the asymptotic behavior of the two-body density matrix.The condensate fraction of fermionic pairs is calculated in the unitary limitand on both sides of the BCS-BEC crossover.Comment: 4 pages, 4 figure

Momentum Distribution and Condensate Fraction of a Fermion Gas in the BCS-BEC Crossover