title: Extracting past-future vacuum correlations using circuit QED.
abstract: We propose a realistic circuit QED experiment to test the extraction of past-future vacuum entanglement to a pair of superconducting qubits. The qubit P interacts with the quantum field along an open transmission line for an interval T(on) and then, after a time-lapse T(off), the qubit F starts interacting for a time T(on) in a symmetric fashion. After that, past-future quantum correlations will have transferred to the qubits, even if the qubits do not coexist at the same time. We show that this experiment can be realized with current technology and discuss its utility as a possible implementation of a quantum memory.
authors.affiliation: Instituto de Física Fundamental, CSIC, Serrano 113-B, 28006 Madrid, Spain. csl@iff.csic.es
authors.forename: Carlos
authors.initials: C
authors.lastname: Sabín
authors.forename: Borja
authors.initials: B
authors.lastname: Peropadre
authors.forename: Marco
authors.initials: M
authors.lastname: del Rey
authors.forename: Eduardo
authors.initials: E
authors.lastname: Martín-Martínez