Quantum turnstiles for robust measurement of full counting statistics

Autor:	Samajdar, Rhine, McCulloch, Ewan, Khemani, Vedika, Vasseur, Romain, Gopalakrishnan, Sarang
Rok vydání:	2023
Předmět:	Quantum Physics Condensed Matter - Quantum Gases Condensed Matter - Statistical Mechanics Condensed Matter - Strongly Correlated Electrons
Druh dokumentu:	Working Paper
Popis:	We present a scalable protocol for measuring full counting statistics (FCS) in experiments or tensor-network simulations. In this method, an ancilla in the middle of the system acts as a turnstile, with its phase keeping track of the time-integrated particle flux. Unlike quantum gas microscopy, the turnstile protocol faithfully captures FCS starting from number-indefinite initial states or in the presence of noisy dynamics. In addition, by mapping the FCS onto a single-body observable, it allows for stable numerical calculations of FCS using approximate tensor-network methods. We demonstrate the wide-ranging utility of this approach by computing the FCS of the transferred magnetization in a Floquet Heisenberg spin chain, as studied in a recent experiment with superconducting qubits, as well as the FCS of charge transfer in random circuits. Comment: 8+3 pages, 4+4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2305.15464 Zobrazit plný text záznamu View this record from Arxiv