2012/07/12 by Shi Biao Zheng, Zheng, Shi Biao
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Physics (quant-ph) #Quantum and electron transport phenomena #quant-ph
paper · pdf · doi:10.48550/arxiv.1207.2882
to be published in Physical Review A
openalex publication_date 2012/07/12 · arxiv created 2012/07/19 · arxiv updated 2012/07/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We show that with the assistance of a third level of the qubits an n-qubit phase gate can be constructed from 2n-4 two-qutrit conditional swap gates, a single qutrit-qubit controlled phase gate, and two single-qutrit operations. Unlike previous schemes, our scheme uses the auxiliary level to "expose" some state to the qutrit-qubit controlled phase gate, instead of using it to "hide" states from the conditional dynamics. Neither the number of the additional levels nor that of single-qutrit operations needs to increase with n. We propose a physical implementation of the required elementary gates in cavity QED, and show that the total gate time may be greatly reduced as compared with that required in the previous methods.