Protocol for generating multi-photon entangled states from quantum dots in the presence of nuclear spin fluctuations

Abstract

Multi-photon entangled states are a crucial resource for many applications in quantum information science. Semiconductor quantum dots offer a promising route to generate such states by mediating photon-photon correlations via a confined electron spin, but dephasing caused by the host nuclear spin environment typically limits coherence (and hence entanglement) between photons to the spin $T_2^{\ast }$ time of a few nanoseconds. We propose a protocol for the deterministic generation of multi-photon entangled states that is inherently robust against the dominating slow nuclear spin environment fluctuations, meaning that coherence and entanglement is instead limited only by the much longer spin $T_2$ time of microseconds. Unlike previous protocols, the present scheme allows for the generation of very low error probability polarisation encoded three-photon GHZ states and larger entangled states, without the need for spin echo or nuclear spin calming techniques.

References in corpus (14)

• Quantum Computing
• QuTiP 2: A Python framework for the dynamics of open quantum systems
• Deterministic Generation of a Cluster State of Entangled Photons
• Nuclear spin physics in quantum dots: an optical investigation
• A photonic cluster state machine gun
• Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot
• Localizable Entanglement
• From three-photon GHZ states to ballistic universal quantum computation
• Electron Spin Dephasing due to Hyperfine Interactions with a Nuclear Spin Bath
• Optically generated 2-dimensional photonic cluster state from coupled quantum dots
• Quantum control of a spin qubit coupled to a photonic crystal cavity
• Dynamics of Quantum Dot Nuclear Spin Polarization Controlled by a Single Electron
• Improving a solid-state qubit through an engineered mesoscopic environment
• Error distributions on large entangled states with non-Markovian dynamics