Buğu, SinanÖzaydın, FatihFerrus, ThierryKodera, Tetsuo2020-03-232020-03-232020-02-26Buğu, S., Özaydın, F., Ferrus, T. & Kodera, T. (2020). Preparing multipartite entangled spin qubits via pauli spin blockade. Scientific Reports, 10(1), 1-8. doi:10.1038/s41598-020-60299-62045-2322https://hdl.handle.net/11729/2285http://dx.doi.org/10.1038/s41598-020-60299-6Preparing large-scale multi-partite entangled states of quantum bits in each physical form such as photons, atoms or electrons for each specific application area is a fundamental issue in quantum science and technologies. Here, we propose a setup based on Pauli spin blockade (PSB) for the preparation of large-scale W states of electrons in a double quantum dot (DQD). Within the proposed scheme, two W states of n and m electrons respectively can be fused by allowing each W state to transfer a single electron to each quantum dot. The presence or absence of PSB then determines whether the two states have fused or not, leading to the creation of a W state of n + m ? 2 electrons in the successful case. Contrary to previous works based on quantum dots or nitrogen-vacancy centers in diamond, our proposal does not require any photon assistance. Therefore the ‘complex’ integration and tuning of an optical cavity is not a necessary prerequisite. We also show how to improve the success rate in our setup. Because requirements are based on currently available technology and well-known sensing techniques, our scheme can directly contribute to the advances in quantum technologies and, in particular in solid state systems.eninfo:eu-repo/semantics/openAccessCharge noiseSemiconductor quantum dotsQuantum dotsArticle10118Q2Q2WOS:000563209800018PMID:32103078321030782-s2.0-8508008400910.1038/s41598-020-60299-6Q1