Remote preparation of continuous-variable qubits using loss-tolerant hybrid entanglement of light

TL;DR

This paper demonstrates remote state preparation between discrete-variable and continuous-variable quantum nodes using hybrid entanglement, enabling the transfer of arbitrary quantum states across different encoding platforms.

Contribution

It introduces a method for remote preparation of continuous-variable qubits using hybrid entanglement between heterogeneous quantum systems.

Findings

Successful remote preparation of arbitrary coherent-state superpositions.

Quantum state tomography confirms the fidelity of the prepared states.

Negative Wigner functions demonstrate non-classicality of the states.

Abstract

Transferring quantum information between distant nodes of a network is a key capability. This transfer can be realized via remote state preparation where two parties share entanglement and the sender has full knowledge of the state to be communicated. Here we demonstrate such a process between heterogeneous nodes functioning with different information encodings, i.e., particle-like discrete-variable optical qubits and wave-like continuous-variable ones. Using hybrid entanglement of light as a shared resource, we prepare arbitrary coherent-state superpositions controlled by measurements on the distant discrete-encoded node. The remotely prepared states are fully characterized by quantum state tomography and negative Wigner functions are obtained. This work demonstrates a novel capability to bridge discrete- and continuous-variable platforms.