2 results about "Normal mode" patented technology

The present application belongs to the field of underwater target recognition, and proposes a robust discrimination method for the depth attribute of line spectrum target of vertical array. The method increases sampling points in the depth direction of shallow water waveguide, filters the internal coupled mode of the received sound pressure amplitude of vertical array by using the mode orthogonality formed by vertical array sampling, and extracts the robust line spectrum sound pressure amplitude fluctuation feature in the horizontal distance dimension of sound source. The sound pressure amplitude of vertical array is obtained by fusing the array element data. The mode orthogonality makes the sound pressure amplitude of vertical array eliminate the influence of the coherent term of normal mode related to the distance of sound source and the receiving depth on the line spectrum amplitude fluctuation feature. The present application uses a small amount of sound pressure amplitude data of vertical array to construct the discrimination feature quantity sound pressure amplitude fluctuation index, realizes efficient discrimination, and has small calculation amount. At the same time, the discrimination performance of the depth attribute of sound source does not decrease with the change of the relative horizontal distance of sound source, and has robustness.

We provide a large-scale multi-qubit trap ion gate. [Solution] A system (20) for quantum computing includes an array of qubits (40) and a radiation source (28) that simultaneously irradiates multiple qubits in the array with radiation containing a set of spectral components in multiple vibrational sidebands of the internal transition frequencies of the qubits, each having a different complex amplitude. The sidebands are generated by a group of normal modes having a minimum spacing Δf between their respective vibrational frequencies. A controller (32) initializes a multi-qubit gate containing at least five qubits to an initial state and drives the radiation source to irradiate each qubit with radiation containing the respective complex amplitude of the spectral components in a selected set, so as to switch the multi-qubit gate to a target state within a gate time of less than 50 / Δf.