Multi-qubit entanglement generation with squeezed modes

TL;DR

This paper introduces a hybrid entanglement generation protocol using linear optics and homodyne measurements, capable of producing multiple high-fidelity Bell pairs efficiently, with success probability influenced by squeezing strength.

Contribution

It presents a novel hybrid continuous-discrete variable protocol that enhances multi-qubit entanglement generation using linear optics and squeezing, with practical success probabilities.

Findings

Multiple Bell pairs can be generated per protocol iteration.

Approximately 3 dB of additional squeezing is needed per Bell pair.

Single Bell pairs are generated with about 75% success probability at certain squeezing levels.

Abstract

We present a hybrid continuous variable-discrete variable entanglement generation protocol using linear optics and homodyne measurements, capable of producing multiple high-fidelity Bell pairs per protocol iteration, with an approximate $0.5$ success probability. The effectiveness of the protocol is determined by the squeezing strength. To increase the number of Bell pairs, approximately 3 dB of extra squeezing is needed for each additional Bell pair. The protocol also generates single Bell pairs with an approximate $0.75$ probability for squeezing strengths $\lessapprox 15dB$, achievable with current technology.