# LOCC distinguishable orthogonal product states with least entanglement resource

## TL;DR

This paper constructs specific sets of orthogonal product states in high-dimensional bipartite systems that are locally indistinguishable but can be distinguished using LOCC with minimal entanglement resources.

## Contribution

It introduces new classes of orthogonal product states that are locally indistinguishable and demonstrates their distinguishability with minimal entanglement resources.

## Key findings

- Constructed $2n-1$ indistinguishable states in $
C^n\otimes\nC^4$ and $
C^n\otimes\nC^5$.
- Developed larger sets of indistinguishable states in higher dimensions.
- Showed these states are LOCC-distinguishable with a single $
C^2\otimes\nC^2$ maximally entangled state.

## Abstract

In this paper, we construct $2n-1$ locally indistinguishable orthogonal product states in $\mathbb{C}^n\otimes\mathbb{C}^{4}~(n>4)$ and $\mathbb{C}^n\otimes\mathbb{C}^{5}~(n\geq 5)$ respectively. Moreover, a set of locally indistinguishable orthogonal product states with $2(n+2l)-8$ elements in $\mathbb{C}^n\otimes\mathbb{C}^{2l}~(n\geq 2l>4)$ and a class of locally indistinguishable orthogonal product states with $2(n+2k+1)-7$ elements in $\mathbb{C}^n\otimes\mathbb{C}^{2k+1}~(n\geq 2k+1>5)$ are also constructed respectively. These classes of quantum states are then shown to be distinguishable by local operation and classical communication (LOCC) using a suitable $\mathbb{C}^2\otimes\mathbb{C}^2$ maximally entangled state respectively.