Astronomical interferometry using continuous variable quantum teleportation

TL;DR

This paper introduces a continuous variable quantum teleportation method for astronomical interferometry, enabling high-precision measurements over long distances by overcoming transmission losses with entangled states and linear optics.

Contribution

It presents a novel interferometry scheme using continuous variable quantum teleportation with linear optics and multiphoton events, improving over previous discrete-variable approaches.

Findings

Scheme outperforms direct detection in certain regimes

Uses linear optics without wasting stellar photons

Leverages multiphoton events as noise advantage

Abstract

We propose a method to build an astronomical interferometer using continuous variable quantum teleportation to overcome the transmission loss between distant telescopes. The scheme relies on two-mode squeezed states shared by distant telescopes as entanglement resources, which are distributed using continuous variable quantum repeaters. We find the optimal measurement on the teleported states, which uses beam-splitters and photon-number-resolved detection. Compared to prior proposals relying on discrete states, our scheme has the advantages of using linear optics to implement the scheme without wasting stellar photons, and making use of multiphoton events, which are regarded as noise in previous discrete schemes. We also outline the parameter regimes in which our scheme outperforms the direct detection method, schemes utilizing distributed discrete-variable entangled states, and local heterodyne techniques.