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We develop a nonequilibrium increment method to compute the R\'enyientanglement entropy and investigate its scaling behavior at the deconfinedcritical (DQC) point via large-scale quantum Monte Carlo simulations. Tobenchmark the method, we first show that at an conformally-invariant criticalpoint of O(3) transition, the entanglement entropy exhibits universal scalingbehavior of area law with logarithmic corner corrections and the obtainedcorrection exponent represents the current central charge of the criticaltheory. Then we move on to the deconfined quantum critical point, wherealthough we still observe similar scaling behavior but with a very differentexponent. Namely, the corner correction exponent is found to be negative. Sucha negative exponent is in sharp contrast with positivity condition of theR\'enyi entanglement entropy, which holds for unitary conformal fieldtheories(CFT). Our results unambiguously reveal fundamental differences betweenDQC and quantum critical points(QCPs) described by unitary CFTs.

Scaling of entanglement entropy at deconfined quantum criticality