Are optical quantum information processing experiments possible without beamsplitter?

TL;DR

This paper explores whether optical quantum information processing can be achieved without beamsplitters, analyzing the role and limitations of beamsplitter-type Hamiltonians in various quantum technologies.

Contribution

It introduces a new approach to describe quantum operations without relying solely on beamsplitters, highlighting their applications and limitations in quantum information processing.

Findings

Beamsplitter-type Hamiltonians are crucial in quantum measurement and state engineering.

The paper discusses alternative methods to linear optical elements in quantum tech.

Limitations of linear optical elements are analyzed in the context of quantum experiments.

Abstract

The significance of beamsplitter in experimental optical quantum information processing and quantum technology is discussed with a focus on the role of a beamsplitter-type Hamiltonian in the recent development in this field of research. Here, we follow a new approach to briefly describe quantum measurement, Bell measurement, quantum state engineering, quantum teleportation, cryptography, and computation using both discrete and continuous variables to establish the wide applications of beamsplitter-type operation. Finally, we also discuss the limitations of this linear optical element.