A readout-integrated time-bin qutrit analyzer for echo-based quantum memories

TL;DR

This paper introduces a novel method for analyzing time-bin qutrits in echo-based quantum memories, enabling full state characterization through successive partial readouts and demonstrating its application in a specific atomic system.

Contribution

The paper presents a new protocol for projecting time-bin qutrits in quantum memories using successive partial readouts, allowing complete state characterization.

Findings

Successful simulation of the full storage process.

Experimental demonstration with bright time-bin pulses in Eu-doped crystal.

Development of a compound pulse for rapid partial readouts.

Abstract

We present a method to project time-bin qutrits stored in an echo-based quantum memory using several successive partial readouts of the memory. We demonstrate how this scheme can be used to implement projections onto a full set of mutually unbiased bases and, therefore, enables the characterization of arbitrary quantum states. Further, we study the integration of this protocol for the case of atomic frequency comb spin-wave storage by simulating the full storage process and performing a storage experiment with bright time-bin pulses in $^{151}$Eu$^{3+}$:Y$_2$SiO$_5$. In this context, a compound pulse for implementing partial readouts in quick succession is introduced and characterized.