2009/02/28 by Ulrich Poschinger, U. G. Poschinger, G. Huber +17 · 2 citations
Computer Science · Physics and Astronomy · #Atomic physics #Charge qubit #Condensed matter physics #Ground state #Ion #Ion trap #Magnetic field #Orbital Angular Momentum in Optics #Phase qubit #Phonon #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum mechanics #Qubit #Rabi cycle #Resonance (particle physics) #Sideband #Spin (aerodynamics) #Trap (plumbing) #Trapped ion quantum computer #Zeeman effect #quant-ph
paper · pdf · doi:10.1088/0953-4075/42/15/154013
arxiv created 2009/03/01 · openalex publication_date 2009/07/15 · arxiv updated 2015/05/12 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We demonstrate the implementation of a spin qubit with a single 40 Ca + ion in a micro ion trap. The qubit is encoded in the Zeeman ground state levels m J = +1/2 and m J = −1/2 of the S 1/2 state of the ion. We show sideband cooling close to the vibrational ground state and demonstrate the initialization and readout of the qubit levels with 99.5% efficiency. We employ a Raman transition close to the S 1/2 –P 1/2 resonance for coherent manipulation of the qubit. We observe single qubit rotations with 96% fidelity and gate times below 5 µs. Rabi oscillations on the blue motional sideband are used to extract the phonon number distribution. The dynamics of this distribution is analysed to deduce the trap-induced heating rate of 0.3(1) phonons ms −1 .