Multiparticle singlet states cannot be maximally entangled for the bipartitions

TL;DR

This paper demonstrates that multiparticle singlet states cannot be maximally entangled across all bipartitions, revealing fundamental limitations relevant to quantum coding and theoretical physics.

Contribution

It establishes the incompatibility between multiparticle singlet states and maximal bipartition entanglement, providing new insights into quantum state construction.

Findings

Multiparticle singlet states are not maximally entangled for all bipartitions.

The space of pure multiparticle singlet states lacks states with maximal bipartition entanglement.

Results impact quantum code design and theoretical physics discussions.

Abstract

One way to explore multiparticle entanglement is to ask for maximal entanglement with respect to different bipartitions, leading to the notion of absolutely maximally entangled states or perfect tensors. A different path uses unitary invariance and symmetries, resulting in the concept of multiparticle singlet states. We show that these two concepts are incompatible in the sense that the space of pure multiparticle singlet states does not contain any state for which all partitions of two particles versus the rest are maximally entangled. This puts restrictions on the construction of quantum codes and contributes to discussions in the context of the AdS/CFT correspondence and quantum gravity.