Dispersive optics for scalable raman driving of hyperfine qubits

A quantum computer device, comprising:

• a source of particles;
• a confinement system configured to generate a plurality of confinement regions to hold a plurality of particles therein, the particles having a first quantum state;
• an excitation source for generating an amplitude-modulated beam and directing the amplitude-modulated beam to at least one particle in the plurality of particles, thereby driving transitions of the at least one particle between the first quantum state and a second quantum state;
• and
• an observing system for determining the states of the plurality of particles, wherein the excitation source comprises:
• a coherent light source configured to generate a phase-modulated beam having a plurality of frequency components;
• and
• a dispersive optical element, the dispersive optical element having a group delay dispersion, the dispersive optical element configured to receive the phase-modulated beam, to introduce an optical phase shift to each of the plurality of the frequency components, wherein the values of the optical phase shift vary non-linearly with frequency according to the group delay dispersion, and to recombine the plurality of frequency components, thereby generating the amplitude-modulated beam.

A method of modulating an amplitude of a light beam, comprising:

• generating a coherent phase-modulated light beam having a plurality of frequency components;
• directing the phase-modulated light beam at a dispersive optical element selected from a chirped Bragg grating (CBG), a chirped Bragg mirror (CBM), or an overcoupled optical resonator, the dispersive optical element having a group delay dispersion, thereby introducing an optical phase shift to each of the plurality of the frequency components, wherein the values of the optical phase shift vary non-linearly with frequency according to the group delay dispersion;
• and
• recombining the plurality of frequency components, thereby generating an amplitude-modulated beam.

A method of operating a quantum computer device, the method comprising:

• generating a plurality of confinement regions holding a plurality of particles therein, the particles having a first quantum state;
• generating an amplitude-modulated beam;
• directing the amplitude-modulated beam at at least one particle of the plurality of particles, thereby driving transitions of the at least one particle of the plurality of particles between the first quantum state and a second quantum state;
• and
• determining the states of the plurality of particles,
• wherein generating the amplitude-modulated beam comprises:
• generating a coherent phase-modulated light beam having a plurality of frequency components;
• directing the phase-modulated light beam at a dispersive optical element, the dispersive optical element having a group delay dispersion, thereby introducing an optical phase shift to each of the plurality of the frequency components, wherein the values of the optical phase shift vary non-linearly with frequency according to the group delay dispersion;
• and
• recombining the plurality of frequency components, thereby generating the amplitude-modulated beam.