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We propose a new quantum Monte Carlo algorithm which realizes a relaxationintrinsic to the original quantum system. The Monte Carlo dynamics satisfiesthe dynamic scaling relation $\tau\sim \xi^z$ and is independent of the Trotternumber. Finiteness of the Trotter number just appears as the finite-sizeeffect. An infinite Trotter number version of the algorithm is also formulated,which enables us to observe a true relaxation of the original system. Thestrategy of the algorithm is a compromise between the conventional worldlinelocal flip and the modern cluster loop flip. It is a local flip in thereal-space direction and is a cluster flip in the Trotter direction. The newalgorithm is tested by the transverse-field Ising model in two dimensions. Anaccurate phase diagram is obtained.Comment: 9 pages, 4 figure

A Quantum Monte Carlo Algorithm Realizing an Intrinsic Relaxation