Quantum Monte Carlo (QMC) is a class of stochastic numerical techniques used to solve quantum many-body problems by sampling configurations in Hilbert or real space according to probability distributions derived from the wavefunction or density matrix. Methods such as variational Monte Carlo, diffusion Monte Carlo, path-integral Monte Carlo, and auxiliary-field QMC enable accurate estimation of ground-state and finite-temperature properties of interacting electrons, nuclei, or spins. QMC techniques explicitly incorporate electron correlation and can achieve near-exact benchmark energies, but often face challenges such as the fermion sign problem, finite-size effects, and the need for high-quality trial wavefunctions or constrained-path approximations.
For the first time, scientists have directly imaged the quantum process underlying superconductivity, a phenomenon in which paired electrons cause electric current to flow without resistance at sufficiently low temperatures. ...
Condensed Matter
Apr 15, 2026
1
268
Rydberg atoms are atoms with one or more outer electrons excited to very high energy levels, which interact very strongly with each other. These atoms are widely used to run quantum simulations and develop quantum technologies, ...
The world's most powerful supercomputer is helping resolve conflicting research results that have puzzled scientists for more than a decade, which could also shine new light inside collapsing stars.
General Physics
Sep 3, 2024
0
164
Strongly interacting systems play an important role in quantum physics and quantum chemistry. Stochastic methods such as Monte Carlo simulations are a proven method for investigating such systems. However, these methods reach ...
Quantum Physics
May 15, 2024
0
259
Quantum many-body systems are things such as atomic nuclei that consist of many tiny particles moving in complex ways. This makes it extremely difficult to predict how the systems behave as the particles interact. To study ...
Quantum Physics
Apr 9, 2024
0
159
Entanglement is a widely studied quantum physics phenomenon, in which two particles become linked in such a way that the state of one affects the state of another, irrespective of the distance between them. When studying ...
