Generation and entanglement study of generalized N-mode single photon perfect W-states

TL;DR

This paper proposes methods to generate and verify entangled N-mode single photon perfect W-states using integrated photonic structures, with new entanglement conditions based on su(2) algebra, enabling scalable quantum communication applications.

Contribution

It introduces novel schemes for generating generalized N-mode single photon perfect W-states and derives simplified entanglement conditions based on su(2) algebra for verification.

Findings

Proposed integrated waveguide structures for state generation.

Derived generalized entanglement conditions using su(2) algebra.

Presented experimental schemes for entanglement verification.

Abstract

We consider single photon realization of generalized N-qubit perfect W-states which are suitable for perfect teleportation and superdense coding. We propose schemes to generate generalized N-mode single photon perfect W-states and derive entanglement conditions which for single photon states require finding fidelity with generalized N-mode single photon perfect W-states and hence more suitable to detect the genuine entanglement of generalized perfect W-states. Based on the evolution of single photon wavefunction in scalable integrated photonic lattices, we present schemes for the preparation of generalized N-mode single photon perfect W-states at desired propagation distance. The integrated waveguide structures can precisely be fabricated, offer low photon propagation losses and can be integrated on a chip. We consider both planar and ring type waveguide structures for state generation. We derive set of generalized entanglement conditions using the sum uncertainty relations of generalized su(2) algebra operators. We show that any given genuinely entangled N-mode single photon state is a squeezed state of a specific su(2) algebra operator and can be expressed as superposition of a pair of orthonormal generalized N-mode single photon perfect W-states which are eigenstates of that specific su(2) algebra operator. Within the single photon subspace, the eigendecomposition of su(2) algebra operators reduces the generalized entanglement condition to a simplified single photon separability condition. In order to verify the entanglement of given genuinely entangled N-mode single photon state using this condition one has to find the difference between the state fidelities with suitably chosen pair of orthonormal generalized N-mode single photon perfect W-states. Finally, we propose an experimental scheme to verify the entanglement using the proposed conditions...