Manipulation of quantum states in memory cell: controllable Mach-Zehnder interferometer

TL;DR

This paper explores how a tripod-type atomic memory cell can manipulate quantum signals, enabling storage, transformation, and entanglement, with potential applications in quantum logic operations within a Mach-Zehnder interferometer setup.

Contribution

It demonstrates the use of a tripod atomic memory cell for quantum signal manipulation, including storage, transformation, and entanglement, in a Mach-Zehnder interferometer configuration.

Findings

Memory cell can store and transform quantum signals.

Partial readout entangles light with atomic ensemble.

Cell enables quantum logical operations, including two-qubit gates.

Abstract

In this article, we consider the possibility of manipulation of quantum signals, ensured by the use of the tripod-type atomic memory cell. We show that depending on a configuration of driving fields at the writing and reading, such a cell allows both to store and transform the signal. It is possible to provide the operation of the memory cell in a Mach-Zehnder interferometer mode passing two successive pulses at the input. We proposed a procedure of partial signal read out that provides entanglement between the retrieved light and the atomic ensemble. Thus, we have shown that tripod atomic cell is a promising candidate to implement of quantum logical operations, including two-qubit ones, that can be performed on the basis of only one cell.