A scalable quantum computer with ultranarrow optical transition of ultracold neutral atoms in an optical lattice

Abstract

We propose a new quantum-computing scheme using ultracold neutral ytterbium atoms in an optical lattice. The nuclear Zeeman sublevels define a qubit. This choice avoids the natural phase evolution due to the magnetic dipole interaction between qubits. The Zeeman sublevels with large magnetic moments in the long-lived metastable state are also exploited to address individual atoms and to construct a controlled-multiqubit gate. Estimated parameters required for this scheme show that this proposal is scalable and experimentally feasible.

Laser-driven Sisyphus cooling in an optical dipole trap

“…Ultracold samples of such atoms are of great interest in the context of optical clocks [19][20][21], precise tests of fundamental physics [19,22,23], quantum computing [24,25] and quantum simulation [26]. We focus on applying our scheme to the cases of 88 Sr and 174 Yb and perform relevant calculations for the 1 S 0 → 3 P 1 transition (wavelength λ Sr(Yb) = 689(556)nm, linewidth γ Sr(Yb) = 2π × 7.4(182) kHz).…”

Quantum chaos in ultracold collisions betweenYb(1S0)andYb(3P2)Green1, Vaillant2, Frye3 et al. 2016Phys. Rev. A162110View full textAdd to dashboardCite

“…is of interest for applications in quantum information processing [17] and quantum computing [18,19]. Takahashi and coworkers have measured Feshbach resonances in this system [20,21], and we discuss how the signatures of quantum chaos could be observed with current experimental capabilities.…”

Single-spin addressing in an atomic Mott insulator

“…The quest to address atoms on single sites of an optical lattice has a long history [7,[13][14][15][16][17][18][19][20][21][22]. In one dimension, single-site addressing was accomplished optically † present address: Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark.…”

“…For scalable quantum information processing, a Mott insulator with unity filling provides a natural quantum register with several hundreds of qubits. In order to exploit the full potential of such a large scale system for quantum computation, coherent manipulation of individual spins is indispensable, both within a circuit-based [10] or a one-way quantum computer architecture [11,12].The quest to address atoms on single sites of an optical lattice has a long history [7,[13][14][15][16][17][18][19][20][21][22]. In one dimension, single-site addressing was accomplished optically † present address: Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark.…”