Universal gates for transforming multipartite entangled Dicke states

Toshiki Kobayashi, Rikizo Ikuta, Şahin Kaya Özdemir, Mark Tame, Takashi Yamamoto, Masato Koashi, Nobuyuki Imoto

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


We determine the minimal number of qubits that it is necessary to have access to in order to transform Dicke states into other Dicke states. In general, the number of qubits in Dicke states cannot be increased via transformation gates by accessing only a single qubit, in direct contrast to other multipartite entangled states such as GHZ, W and cluster states. We construct a universal optimal gate which adds spin-up qubits or spin-down qubits to any Dicke state by minimal access. We also show the existence of a universal gate which transforms any size of Dicke state as long as it has access to at least the required number of qubits. Our results have important consequences for the generation of Dicke states in physical systems such as ion traps, all-optical setups and cavity-quantum electrodynamic settings where they can be used for a variety of quantum information processing tasks.

Original languageEnglish (US)
Article number023005
JournalNew Journal of Physics
StatePublished - Feb 2014

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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