Constructing and programming quantum hardware for robust quantum annealing processes

    公开(公告)号:US10346760B2

    公开(公告)日:2019-07-09

    申请号:US15109614

    申请日:2014-12-31

    Applicant: Google LLC

    Abstract: Methods, systems and apparatus for constructing and programming quantum annealing hardware. In one aspect, a method includes deriving data characterizing an energy spectrum of a Hamiltonian Htotal that characterizes quantum states of a quantum processor, wherein the quantum processor is controllable such that the Hamiltonian Htotal evolves from an initial Hamiltonian Hi to a problem Hamiltonian Hp comprising an energy spectrum that encodes a solution to an optimization problem, the deriving being based on Hi and Hp at a time that Htotal has the energy spectrum; estimating an average phonon energy of a bath in which the quantum processor is located; and determining, based on the derived data and the calculated average phonon energy, an additional Hamiltonian HQG that when combined with Htotal limits evolution of the quantum state of the quantum processor into the ground state of Hp when Htotal evolves to Hp without diagonalizing Hp.

    Probabilistic inference in machine learning using a quantum oracle

    公开(公告)号:US10339466B1

    公开(公告)日:2019-07-02

    申请号:US14484039

    申请日:2014-09-11

    Applicant: Google LLC

    Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for using a quantum oracle to make inference in complex machine learning models that is capable of solving artificial intelligent problems. Input to the quantum oracle is derived from the training data and the model parameters, which maps at least part of the interactions of interconnected units of the model to the interactions of qubits in the quantum oracle. The output of the quantum oracle is used to determine values used to compute loss function values or loss function gradient values or both during a training process.

    ARTIFICIAL THERMAL BATH
    106.
    发明申请

    公开(公告)号:US20180336299A1

    公开(公告)日:2018-11-22

    申请号:US15771109

    申请日:2015-10-29

    Applicant: Google LLC

    CPC classification number: G06F17/5009 G06N99/002

    Abstract: Methods, systems, and apparatus for designing an artificial quantum thermal bath. In one aspect, an apparatus includes a primary quantum system; an auxiliary quantum system comprising a plurality of modes and that interacts with the primary quantum system, wherein: the auxiliary system interacts with the primary quantum system through one or more couplings, wherein the one or more couplings are controllable; a steady state of the auxiliary system, a response function of the auxiliary quantum system, an auxiliary system operator, and a spectrum of the auxiliary quantum system are determined to meet a respective condition; and the auxiliary system is controllable to relax the primary quantum system to an equilibrium state using a controllable function of the auxiliary system operator.

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