Zobrazeno 1 - 10
of 63
pro vyhledávání: '"Zou, Yijian"'
Autor:
Hu, Yangrui, Zou, Yijian
Given a tripartite quantum state on $A,B,C$ and the erasure channel on $C$, the rotated Petz map is a recovery channel that acts on $B$ to recover the erased quantum information. The infidelity of the best recovery is upper-bounded by the conditional
Externí odkaz:
http://arxiv.org/abs/2408.00857
Autor:
Zhou, Zheng, Zou, Yijian
Boundaries not only are fundamental elements in nearly all realistic physical systems, but also greatly enrich the structure of quantum field theories. In this paper, we demonstrate that conformal field theory (CFT) with a boundary, known as surface
Externí odkaz:
http://arxiv.org/abs/2407.15914
The low-energy subspace of a conformal field theory (CFT) can serve as a quantum error correcting code, with important consequences in holography and quantum gravity. We consider generic 1+1D CFT codes under extensive local dephasing channels and ana
Externí odkaz:
http://arxiv.org/abs/2406.09555
Publikováno v:
SciPost Phys. 17, 021 (2024)
Defects are common in physical systems with boundaries, impurities or extensive measurements. The interaction between bulk and defect can lead to rich physical phenomena. Defects in gapless phases of matter with conformal symmetry usually flow to a d
Externí odkaz:
http://arxiv.org/abs/2401.00039
Open system quantum dynamics can generate a variety of long-range entangled mixed states, yet it has been unclear in what sense they constitute phases of matter. To establish that two mixed states are in the same phase, as defined by their two-way co
Externí odkaz:
http://arxiv.org/abs/2310.08639
We probe the multipartite entanglement structure of the vacuum state of a CFT in 1+1 dimensions, using recovery operations that attempt to reconstruct the density matrix in some region from its reduced density matrices on smaller subregions. We use a
Externí odkaz:
http://arxiv.org/abs/2307.14434
Publikováno v:
Phys. Rev. Lett. 130, 250403 (2023)
We analyze the effect of decoherence, modelled by local quantum channels, on quantum critical states and we find universal properties of the resulting mixed state's entanglement, both between system and environment and within the system. Renyi entrop
Externí odkaz:
http://arxiv.org/abs/2301.07141
Publikováno v:
Phys. Rev. Lett. 130, 220404 (2023)
We investigate the prospects of employing the linear cross-entropy to experimentally access measurement-induced phase transitions (MIPT) without requiring any postselection of quantum trajectories. For two random circuits that are identical in the bu
Externí odkaz:
http://arxiv.org/abs/2209.00609
Given a critical quantum spin chain with a microscopic Lie-group symmetry, corresponding e.g. to $U(1)$ or $SU(2)$ spin isotropy, we numerically investigate the emergence of Kac-Moody symmetry at low energies and long distances. In that regime, one s
Externí odkaz:
http://arxiv.org/abs/2206.01656
The modular commutator is a recently discovered multipartite entanglement measure that quantifies the chirality of the underlying many-body quantum state. In this Letter, we derive a universal expression for the modular commutator in conformal field
Externí odkaz:
http://arxiv.org/abs/2206.00027