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Title: Measurement-induced criticality in random quantum circuits

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4]
  1. Station Q, Microsoft Quantum, Santa Barbara, CA (United States); Univ. of California, Santa Barbara, CA (United States). Kavli Inst. of Theoretical Physics
  2. Univ. of California, San Diego, CA (United States)
  3. Univ. of Massachusetts, Amherst, MA (United States)
  4. Univ. of California, Santa Barbara, CA (United States)

We investigate the critical behavior of the entanglement transition induced by projective measurements in (Haar) random unitary quantum circuits. Using a replica approach, we map the calculation of the entanglement entropies in such circuits onto a two-dimensional statistical-mechanics model. In this language, the area- to volume-law entanglement transition can be interpreted as an ordering transition in the statistical-mechanics model. We derive the general scaling properties of the entanglement entropies and mutual information near the transition using conformal invariance. We analyze in detail the limit of infinite on-site Hilbert space dimension in which the statistical-mechanics model maps onto percolation. In particular, we compute the exact value of the universal coefficient of the logarithm of subsystem size in the n th Rényi entropies for n ≥ 1 in this limit using relatively recent results for the conformal field theory describing the critical theory of two-dimensional (2D) percolation, and we discuss how to access the generic transition at finite on-site Hilbert space dimension from this limit, which is in a universality class different from 2D percolation. Here, we also comment on the relation to the entanglement transition in random tensor networks, studied previously in Vasseur et al. [Phys. Rev. B 100, 134203 (2019)].

Research Organization:
Univ. of Massachusetts, Amherst, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF); Gordon and Betty Moore Foundation (GBMF); Alfred P. Sloan Foundation
Grant/Contract Number:
SC0019168; NSF PHY-1748958; DMR-1309667; GBMF4304
OSTI ID:
1603484
Alternate ID(s):
OSTI ID: 1603212
Journal Information:
Physical Review B, Vol. 101, Issue 10; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 160 works
Citation information provided by
Web of Science

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