Optical beam angle and position control system

A quantum information processing (QIP) system for controlling quantum states of ions in an ion chain for quantum operations, comprising:

• a trap configured to implement the ion chain;
• a multi-channel acousto-optic modulator (AOM) configured to receive multiple parallel optical beams and modify one or more of the parallel optical beams for controlling respective ions in the ion chain;
• a telescope having multiple rotatable mirrors and multiple lenses collectively configured to provide a path to an optical beam that is input into the telescope to produce an output optical beam, the output optical beam being made into the parallel optical beams following a diffractive optical element;
• and
• a detector system configured to detect a beam angle, a beam position, or both associated with one of the parallel optical beams being sampled to generate one or more feedback signals to control a rotation of one or more of the rotatable mirrors in the telescope to modify the path and thereby the output optical beam such as to adjust the beam angle, the beam position, or both of the parallel optical beams at the multi-channel AOM;
• wherein the parallel optical beams are provided to the AOM in the QIP system, the AOM being configured to adjust one or more of the parallel optical beams to control respective atomic qubits in the QIP system.

A method for controlling, by an optical beam control system, an optical beam in a quantum information processing (QIP) system, the optical beam control system having a telescope with multiple rotatable mirrors and multiple lenses, a diffractive optical lens, a zoom lens, a detector system having a first sensor and a second sensor, and a multi-channel acousto-optic modulator (AOM), the method comprising:

• receiving, at the telescope, an optical beam;
• producing from the optical beam, by a path collectively provided by the multiple rotatable mirrors and multiple lenses in the telescope, an output optical beam;
• generating from the output optical, by the diffractive optical element and the zoom lens, parallel optical beams;
• providing the parallel optical beams to the multi-channel AOM;
• detecting, from one of the parallel optical beams passing through the multi-channel AOM, a beam angle by the first sensor and a beam position by the second sensor;
• and
• generating, from information provided by the first sensor and the second sensor, one or more feedback signals to control a rotation of one or more of the rotatable mirrors in the telescope to modify the path and thereby the output optical beam such as to adjust the beam angle, the beam position, or both of the parallel optical beams at the multi-channel AOM;
• wherein providing the parallel optical beams comprises adjusting one or more of the parallel optical beams to control respective atomic qubits in the QIP system.