Scalable graph state generation in an atom-nanophotonic interface

C.-H. Chien^1,2, SUMIT GOSWAMI^2*, C.-C. Wu², W.-S. Hiew^1,2, Y.-C. Chen², H. H. Jen^2,3

¹Department of Physics, National Taiwan University, Taipei City, Taiwan
²Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan
³Physics Division, National Center for Theoretical Sciences, Taipei, Taiwan

* Presenter:SUMIT GOSWAMI, email:sumitgoswami@gmail.com

Scalable graph states are essential for measurement-based quantum computation and many entanglement-assisted applications in quantum technologies. Generation of these multipartite entangled states requires a controllable and efficient quantum device with delicate design of generation protocol. Here we propose to prepare high-fidelity and scalable graph states in one and two dimensions, which can be tailored in an atom-nanophotonic cavity via the state carving technique. We propose a systematic protocol to carve out unwanted state components, which facilitates scalable cluster state generations via adiabatic transport of a definite number of atoms in optical tweezers. An analysis of state fidelity is also presented, and the state preparation probability can be optimized via sequential single-photon probes. Our results showcase the capability of an atom-nanophotonic interface for creating graph states and pave the way toward novel problem-specific applications using scalable high-dimensional graph states with stationary qubits.

Keywords: quantum computing, state carving, cluster state, graph state, quantum information