Discrete frequency modulated gates for conditional logic in trapped ion quantum computers
AssigneeDuke University
InventorsKenneth R. Brown, Pak Hong Leung, Shilin Huang, Bichen Zhang
Life of this patent
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Abstract
A system includes a controller configured to reconstitute a continuous waveform to a discrete analogue version. The system includes a numerical optimizer configured to determine frequencies of a pulse sequence. The numerical optimizer uses radial motional mode frequencies and a desired gate time. The numerical optimizer generates the pulse sequence by closing phase-space trajectories, disentangling spins and motions, and constraining a Rabi frequency for motional sideband transitions. The system also includes a display configured to illustrate a discrete frequency modulation pulse sequence based on the determined frequencies.
Claims17
A system comprising:
- a controller configured to reconstitute a continuous waveform to a discrete analogue version;
- a processor configured to determine frequencies of a pulse sequence for the discrete analogue version, wherein the processor uses radial motional mode frequencies, and a desired gate time, wherein the processor generates the pulse sequence by closing phase-space trajectories for the radial motional modes, and disentangles spins and motion, and constrains a Rabi frequency for motional sideband transitions, wherein a field-programmable gate array is configured to trigger frequency updates for direct digital synthesizer (DDS) channels in real-time based on the determined frequencies to correct any phase deviation that results in amplitude error;
- and
- display configured to illustrate a discrete frequency modulation pulse sequence based on the determined frequencies, wherein the discrete frequency modulation pulse sequence is designed to be a sequence of equal-time segments, wherein each of the equal-time segments have a constant frequency.
A system comprising:
- a controller is configured to obtain a predetermined gate time and measured mode frequencies;
- a processor configured to receive the predetermined gate time and measured mode frequencies to determine frequencies for a pulse sequence, wherein the processor eliminates phase-space trajectories including drift of motional mode frequencies that cause spin-motion entanglement and deviation of a geometric phrase, and wherein the processor constrains a Rabi frequency of motional sideband transitions, wherein a field-programmable gate array is configured to trigger frequency updates for direct digital synthesizer (DDS) channels in real-time based on the determined frequencies to correct any phase deviation that results in amplitude error;
- and
- a display device configured to illustrate the pulse sequence based on the predetermined gate time, measured mode frequencies, and the frequencies determined by eliminating the spin-motion entanglement and deviation from the geometric phase.
A method comprising:
- reconstituting a continuous waveform to a discrete analogue version by a controller;
- determining frequencies of a pulse sequence for the discrete analogue version by a processor, wherein the processor uses radial motional mode frequencies, and a desired gate time, wherein the processor generates the pulse sequence by closing phase-space trajectories for the radial motional modes, and wherein the processor disentangles spins and motion, and constrains a Rabi frequency for motional sideband transitions;
- configuring one or more sets of micro-electromechanical system (MEMS) mirrors to deliver beams modified by a direct digital synthesizer (DDS) based on the determined frequencies to correct amplitude error;
- and
- illustrating by a display a discrete frequency modulation pulse sequence based on the determined frequencies, wherein the discrete frequency modulation pulse sequence is designed to be a sequence of equal-time segments, wherein each of the equal-time segments have a constant frequency.
Dependencies are inferred from the claim text.