Time-sliced SSE with boundary-based operators and loop crossings yields unbiased off-diagonal imaginary-time correlators, benchmarked on Ising and XXZ chains.
Sandvik, A generalization of Handscomb’s quantum Monte Carlo scheme — Application to the 1-D Hubbard model, Journal of Physics A: Mathematical and General25, 3667 (1992)
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Imaginary-time correlations in time-sliced stochastic series expansion
Time-sliced SSE with boundary-based operators and loop crossings yields unbiased off-diagonal imaginary-time correlators, benchmarked on Ising and XXZ chains.