Leggett-Garg inequality in electron interferometers
نویسندگان
چکیده
We consider the violation of the Leggett-Garg inequality in electronic Mach-Zehnder inteferometers. This setup has two distinct advantages over earlier quantum-transport proposals: Firstly, the required correlation functions can be obtained without time-resolved measurements. Secondly, the geometry of an interferometer allows one to construct the correlation functions from ideal negative measurements, which addresses the noninvasiveness requirement of the Leggett-Garg inequality. We discuss two concrete realizations of these ideas: the first in quantum Hall edge-channels, the second in a double quantum dot interferometer.
منابع مشابه
Macrorealism inequality for optoelectromechanical systems
We show how to apply the Leggett-Garg inequality to opto-electro-mechanical systems near their quantum ground state. We find that by using a dichotomic quantum nondemolition measurement (via, e.g., an additional circuit-QED measurement device), either on the cavity or on the nano-mechanical system itself, the Leggett-Garg inequality is violated. We argue that only measurements on the mechanical...
متن کاملUnified single-photon and single-electron counting statistics: From cavity QED to electron transport
A key ingredient of cavity QED is the coupling between the discrete energy levels of an atom and photons in a single-mode cavity. The addition of periodic ultrashort laser pulses allows one to use such a system as a source of single photons—a vital ingredient in quantum information and optical computing schemes. Here we analyze and time-adjust the photon-counting statistics of such a single-pho...
متن کاملAbstract Submitted for the MAR14 Meeting of The American Physical Society Avoiding Loopholes with Hybrid Bell-Leggett-Garg Inequalities
Submitted for the MAR14 Meeting of The American Physical Society Avoiding Loopholes with Hybrid Bell-Leggett-Garg Inequalities JUSTIN DRESSEL, ALEXANDER KOROTKOV, Univ of California Riverside — By combining the postulates of macrorealism with Bell-locality, we derive a qualitatively different hybrid inequality that avoids two loopholes that commonly appear in Leggett-Garg and Bell inequalities....
متن کاملInvestigating Leggett-Garg inequality for a two level system under decoherence in a non-Markovian dephasing environment
Leggett-Garg inequalities (LGI) test the correlations of a single system measured at different times. Violation of LGI implies either the absence of a realistic description of the system or the impossibility of measuring the system without disturbing it. We investigate the violation of the Leggett-Garg inequality for a two level system under decoherence in a non-Markovian dephasing environment....
متن کامل