Extracting past-future vacuum correlations using circuit QED

TL;DR

This paper proposes a feasible circuit QED experiment to demonstrate the transfer of past-future vacuum entanglement to superconducting qubits, highlighting potential applications in quantum memory.

Contribution

It introduces a realistic experimental setup for extracting past-future vacuum correlations using circuit QED, advancing quantum information processing capabilities.

Findings

Experiment feasible with current technology

Past-future entanglement can be transferred between non-coexisting qubits

Potential for implementing quantum memory

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.