2018/05/17 by Andrei Galiautdinov, Galiautdinov, Andrei
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Physics of Superconductivity and Magnetism #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Physics (quant-ph) #Quantum and electron transport phenomena
paper · pdf · doi:10.48550/arxiv.1805.06877
openalex publication_date 2018/05/17 · openalex created_date 2022/09/30 · openalex updated_date 2026/07/28
We propose to use the continuous version of the quantum Zeno effect to\neliminate leakage to higher energy states in superconducting quantum computing\narchitectures based on Josephson phase and flux qubits. We are particularly\ninterested in the application of this approach to the single-step\nGreenberger-Horne-Zeilinger (GHZ) state protocol described in [A. Galiautdinov\nand J. M. Martinis, Phys. Rev. A 78, 010305(R) (2008)]. While being\nconceptually appealing, the protocol was found to be plagued with a number of\nspectral crowding and leakage problems. Here we argue that by coupling the\nqubits to a measuring device which continuously monitors leakage to higher\nenergy states (say, to a very lossy resonator of frequency omega =\nE3(qubit)-E1(qubit), with 1 labeling the ground state of the qubit), we could\npotentially restrict the multi-qubit system's evolution to its computational\nsubspace, thus circumventing the above mentioned problems.\n