Quantum scrambling with classical shadows

Autor:	Garcia, Roy J., Zhou, You, Jaffe, Arthur
Rok vydání:	2021
Předmět:	Quantum Physics Condensed Matter - Disordered Systems and Neural Networks High Energy Physics - Theory
Zdroj:	Phys. Rev. Research 3, 033155 (2021)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevResearch.3.033155
Popis:	Quantum dynamics is of fundamental interest and has implications in quantum information processing. The four-point out-of-time-ordered correlator (OTOC) is traditionally used to quantify quantum information scrambling under many-body dynamics. Due to the OTOC's unusual time ordering, its measurement is challenging. We propose higher-point OTOCs to reveal early-time scrambling behavior, and present protocols to measure any higher-point OTOC using the shadow estimation method. The protocols circumvent the need for time-reversal evolution and ancillary control. They can be implemented in near-term quantum devices with single-qubit readout. Comment: 29 pages, 7 figures, comments are welcome
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2102.01008 Zobrazit plný text záznamu View this record from Arxiv