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arXiv:1304.4615 · Scientific Reports

Superfluid qubit systems with ring shaped optical lattices

Luigi Amico A, Davit Aghamalyan, Filip Auksztol, Herbert Crepaz, Rainer Dumke, L. C. Kwek

Published Mar 6, 2014• 135 citations
arXivHTMLPDF

Abstract

We study an experimentally feasible qubit system employing neutral atomic currents. Our system is based on bosonic cold atoms trapped in ring-shaped optical lattice potentials. The lattice makes the system strictly one dimensional and it provides the infrastructure to realize a tunable ring-ring interaction. Our implementation combines the low decoherence rates of neutral cold atoms systems, overcoming single site addressing, with the robustness of topologically protected solid state Josephson flux qubits. Characteristic fluctuations in the magnetic fields affecting Josephson junction based flux qubits are expected to be minimized employing neutral atoms as flux carriers. By breaking the Galilean invariance we demonstrate how atomic currents through the lattice provide an implementation of a qubit. This is realized either by artificially creating a phase slip in a single ring, or by tunnel coupling of two homogeneous ring lattices. The single qubit infrastructure is experimentally investigated with tailored optical potentials. Indeed, we have experimentally realized scaled ring-lattice potentials that could host, in principle, n ~ 10 of such ring-qubits, arranged in a stack configuration, along the laser beam propagation axis. An experimentally viable scheme of the two-ring-qubit is discussed, as well. Based on our analysis, we provide protocols to initialize, address, and read-out the qubit.

DOI
10.1038/srep04298

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Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543 andNational Institute of Education and Institute of Advanced Studies,Nanyang Technological University, 1 Nanyang Walk, Singapore 637616(Dated: January 11, 2014)We study an experimentally feasible qubit system employing neutral currents. Our system is based on bosoniccold atoms trapped in ring-shaped optical lattice potentials. The lattice makes the system strictly one dimen-sional and it provides the infrastructure to realize a tunable ring-ring interaction. By breaking the Galileaninvariance we demonstrate how atomic currents through the lattice provide a realization of a qubit. We breakthe Galilean invariance either by artificially creating a phase slip in a single ring, or by considering two ho-mogeneous ring lattices, coupled by tunneling interaction. The Hamiltonian of the system effectively leads toa washboard potential in the phase representation, tilted by the applied ’flux’. The single qubit infrastructureis experimentally investigated with tailored optical potentials. An experimentally feasible scheme of the two-ring-qubit is discussed. In this case, the dynamics is demonstrated to show macroscopic quantum self trapping.Time-of-flight expansion maps the pattern of atomic currents into detectable atomic density distributions. Basedon our analysis, we provide viable protocols to initialize, address, and read-out the qubit.
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Through a combination of laser beams, we engineer a two-dimensional optical lattice of Mexican hat potentials able to host atoms in its ring-shaped wells. When tunneling can be ignored (at high laser intensities), we show that a well-defined qubit can be associated to atoms trapped in each of the rings. Each of these two-level systems can be manipulated by a suitable configuration of Raman laser beams imprinting a synthetic flux onto each Mexican hat cell of the lattice. Overall, the system forms a scalable architecture for Atomtronics flux qubits.
We discuss a laser-trapped cold-atom superfluid qubit system. Each qubit is proposed as a macroscopic two-state system based on a set of Bose-Einstein condensate (BEC) currents circulating in a ring, cut with a Josephson barrier. We review the effective low energy description of a single BEC ring. In particular, it is demonstrated that such system has a set of metastable current states which, for certain range of parameters, form an effective two-state system, or a qubit. We show how this qubit can be initialized and manipulated with currently available laser-trapping techniques. We also discuss mechanisms of coupling several such ring qubits as well as measuring individual qubit-ring systems.
We discuss a laser-trapped cold-atom superfluid qubit system. Each qubit is proposed as a macroscopic two-state system based on a set of Bose-Einstein condensate (BEC) currents circulating in a ring, cut with a Josephson barrier. We review the effective low energy description of a single BEC ring. In particular, it is demonstrated that such system has a set of metastable current states which, for certain range of parameters, form an effective two-state system, or a qubit. We show how this qubit can be initialized and manipulated with currently available laser-trapping techniques. We also discuss mechanisms of coupling several such ring qubits as well as measuring individual qubit-ring systems.
We discuss a laser-trapped cold-atom superfluid qubit system. Each qubit is proposed as a macroscopic two-state system based on a set of Bose-Einstein condensate (BEC) currents circulating in a ring, cut with a Josephson barrier. We review the effective low energy description of a single BEC ring. In particular, it is demonstrated that such system has a set of metastable current states which, for certain range of parameters, form an effective two-state system, or a qubit. We show how this qubit can be initialized and manipulated with currently available laser-trapping techniques. We also discuss mechanisms of coupling several such ring qubits as well as measuring individual qubit-ring systems.