2006/03/15 by Éric Charron, E. Charron, M. A. Cirone +6
Chemistry · Computer Science · Physics and Astronomy · #Atom (system on chip) #Atomic physics #Bell state #Chemistry #Computer science #Hyperfine structure #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum computer #Quantum decoherence #Quantum gate #Quantum mechanics #Qubit #Rubidium #quant-ph
paper · pdf · doi:10.1103/physreva.74.012308
published as Phys. Rev. A 74, 012308 (2006) · 9 pages, 5 color figures
arxiv created 2006/03/15 · openalex publication_date 2006/07/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present a detailed, realistic analysis of the implementation of a proposal for a quantum phase gate based on atomic vibrational states, specializing it to neutral rubidium atoms on atom chips. We show how to create a double-well potential with static currents on the atom chips, using for all relevant parameters values that are achieved with present technology. The potential barrier between the two wells can be modified by varying the currents in order to realize a quantum phase gate for qubit states encoded in the atomic external degree of freedom. The gate performance is analyzed through numerical simulations; the operation time is \ensuremath∼10\phantom\rule0.3em0exms with a performance fidelity above 99.9%. For storage of the state between the operations the qubit state can be transferred efficiently via Raman transitions to two hyperfine states, where its decoherence is strongly inhibited. In addition we discuss the limits imposed by the proximity of the surface to the gate fidelity.