Systems and methods for beam shaping for large aspect ratio with a single cylindrical lens
Aspects of the present disclosure relate generally to systems and methods for use in the implementation and/or operation of quantum information processing (QIP) systems, and more particularly, for beam shaping for large aspect ratios with a single cylindrical lens. In some aspects, a QIP system includes a laser source, a cylindrical lens, and an ion trap. The laser source produces a Gaussian laser beam. The cylindrical lens is aligned with at least a portion of the laser beam and shapes the laser beam into a beam having an anamorphic shape. The ion trap includes a plurality of trapped ions addressable by the beam. The cylindrical lens orients the beam relative to the ion trap such that a fast axis of the beam is aligned with an axis of the plurality of trapped ions, and a slow axis of the beam is traverse to the plurality of trapped ions.
1 . A quantum information processing (QIP) system including:
a laser source configured to produce a laser beam, wherein the laser beam is a Gaussian laser beam;
a cylindrical lens aligned with at least a portion of the laser beam and configured to shape the laser beam into a shaped beam having an anamorphic shape; and
an ion trap including a plurality of trapped ions addressable by the shaped beam,
wherein the cylindrical lens is configured to orient the shaped beam relative to the ion trap such that a fast axis of the shaped beam is aligned with an axis of the plurality of trapped ions, and a slow axis of the shaped beam is traverse to the plurality of trapped ions.
2 . The QIP system of claim 1 , wherein a ratio of the slow axis to the fast axis is at least 5:1.
3 . The QIP system of claim 1 , wherein the cylindrical lens is a first cylindrical lens and the shaped beam is a first shaped beam, and wherein:
the first cylindrical lens is removable from the QIP system such that the first cylindrical lens configured to be replaced by the second cylindrical lens; and
the second cylindrical lens is configured to produce a second shaped beam such that a ratio of the fast axis to the slow axis of the second shaped beam is at least 5:1 and is different than the ratio of the fast axis to the slow axis of the first shaped beam.
4 . The QIP system of claim 3 , wherein a radius of curvature of the first cylindrical lens along the slow axis is different than a radius of curvature of the second cylindrical lens along the slow axis.
5 . The QIP system of claim 3 , wherein the first cylindrical lens has a first thickness and the second cylindrical lens has a second thickness, and wherein the first thickness is the same as the second thickness.
6 . The QIP system of claim 3 , wherein a half-angle along the fast axis of the first shaped beam is the same as a half-angle along the fast axis of the second shaped beam.
7 . The QIP system of claim 1 , wherein the cylindrical lens is not paired with another cylindrical lens.
8 . The QIP system of claim 1 , wherein the cylindrical lens is a first cylindrical lens, and wherein the QIP system further includes a cylindrical lens mounting bracket including at least the first cylindrical lens having a first radius of curvature in the direction of the slow axis and a second cylindrical lens, the second cylindrical lens having a second radius of curvature in the direction of the slow axis, the second radius of curvature being different than the second radius of curvature, and wherein the cylindrical lens mounting bracket is actuable relative to the laser beam such that either the first cylindrical lens or the second cylindrical lens can be aligned with the laser beam.
9 . The QIP system of claim 8 , wherein the cylindrical lens mounting bracket is actuable to adjust a focus of the shaped laser beam.
10 . The QIP system of claim 1 , wherein the shaped laser beam has a first half-angle along the fast axis and a second half-angle along the slow axis, and wherein the first half-angle is greater than the second half-angle.
11 . A method for changing a shape of a laser beam used to address trapped ions of a quantum information processing (QIP) system, the method comprising:
aligning a first cylindrical lens with the laser beam, the first cylindrical lens having a first radius of curvature and configured to produce a first shaped beam having a first ratio of the fast axis to the slow axis;
dis-aligning the first cylindrical lens with the laser beam; and
aligning a second cylindrical lens with the laser beam, the second cylindrical lens having a second radius of curvature different than the first radius of curvature and configured to produce a second shaped beam having a second ratio of the fast axis to the slow axis, wherein the second ratio is different than the first ratio.
12 . The method of claim 11 , wherein the first cylindrical lens has a first thickness and the second cylindrical lens has a second thickness, and wherein the first thickness is the same as the second thickness.
13 . The method of claim 11 , wherein a half-angle along the fast axis of the first shaped beam is the same as a half-angle along the fast axis of the second shaped beam.
14 . The method claim 11 , wherein each of the first cylindrical lens and the second cylindrical lens is not paired with another cylindrical lens.
15 . The method of claim 11 , wherein the first cylindrical lens and the second cylindrical lens are coupled to a mounting bracket that is actuable to adjust a focus of the shaped laser beam.
16 . The method of claim 11 , wherein the shaped laser beam has a first half-angle along the fast axis and a second half-angle along the slow axis, and wherein the first half-angle is greater than the second half-angle.
17 . The method of claim 11 , wherein the first ratio of the slow axis to the fast axis is at least 5:1.
18 . A quantum information processing (QIP) system including:
a laser source configured to produce a Gaussian laser beam;
a cylindrical lens mounting bracket including:
a first cylindrical lens configured to shape the Gaussian laser beam into a first shaped beam oriented relative to the ion trap such that a fast axis of the first shaped beam is aligned with an axis of the plurality of trapped ions, and a slow axis of the first shaped beam is traverse to the plurality of trapped ions, the first cylindrical lens having a first radius of curvature in the direction of the slow axis;
a second cylindrical lens configured to shape the Gaussian laser beam into a second shaped beam oriented relative to the ion trap such that a fast axis of the second shaped beam is aligned with the axis of the plurality of trapped ions, and a slow axis of the second shaped beam is traverse to the plurality of trapped ions, the second cylindrical lens having a second radius of curvature in the direction of the slow axis, and the second radius of curvature being different than the first radius of curvature; and
an ion trap including a plurality of trapped ions addressable by the shaped beam; and
wherein the cylindrical lens mounting bracket is actuable relative to the Gaussian laser beam such that either the first cylindrical lens or the second cylindrical lens can be aligned with the Gaussian laser beam.
19 . The QIP system of claim 18 , wherein the cylindrical lens mounting bracket is actuable in a direction substantially parallel to the Gaussian laser beam to adjust a focus of the first shaped beam or the second shaped beam.
20 . The QIP system of claim 18 , wherein the first shaped beam has a ratio of the slow axis to the fast axis that is at least 5:1; and wherein the second shaped beam has a ratio of the slow axis to the fast axis that is different than the ratio of the first shaped beam.