Abstract: Aspects of the present disclosure describe techniques for optical alignment using a reflective dove prism. For example, a system for optical alignment is described that includes an assembly having a housing with three separate, reflecting structures positioned to produce three reflections of one or more laser beams or one or more images, and a controller configured to control a rotation of the assembly about a pivot point to produce a tilt in orientation of the one or more lasers beams or the one or more images that is twice an angle of rotation of the assembly. Another system and a method for aligning laser beams using a housing with three separate, reflecting structures in a trapped ion quantum information processing (QIP) system are also described.

Abstract: The disclosure describes various aspects of a software-defined quantum computer. For example, a software-defined quantum computer and an expandable/modular quantum computer are described. Also described are at least a software-defined quantum architecture, a resource manager workflow, a quantum compiler architecture, hardware description language configuration, levels of application programming interface (API) access points, and exception handling in software-defined quantum architecture.

Abstract: Aspects of a vibrationally isolated cryogenic shield for local high-quality vacuum are described. More specifically, a cryogenic vacuum system is described that is replicated in a small volume in a mostly room temperature ultra-high vacuum (UHV) system by capping the volume with a suspended cryogenic cold finger coated with a high surface area sorption material to produce a localized extreme high vacuum (XHV) or near-XHV region. The system ensures that paths from outgassing materials to the control volume, including bounce paths off other warm surfaces, require at least one bounce off of the high surface area sorption material on the cold finger. The outgassing materials can be pumped before reaching the control volume. To minimize vibrations, the cold finger is only loosely, mechanically connected to the rest of the chamber, and isolated along with the cryogenic system via soft vacuum bellows.

Abstract: A computer-implemented method, system and a computer readable medium storing executable instructions for optimizing a quantum circuit are disclosed. The computer-implemented method includes receiving one or more parameters for simulation of evolution of at least one quantum state of a chemical entity to be simulated; generating a quantum circuit for the simulation; performing one or more operations to minimize quantum resources to be used for the generated quantum circuit based on the one or more parameters; and placing quantum resources among one or more elementary logical units (ELUs) based on any one or more of: frequency of occurrence of the quantum resources in the generated quantum circuit, order of occurrence of the quantum resources in the generated quantum circuit, connectivity parameters between one or more quantum resources, efficiency of gates between specific quantum resources, quality of gates between specific quantum resources or a combination thereof.

Abstract: The disclosure describes various aspects related to enabling effective multi-qubit operations, and more specifically, to techniques for enabling parallel multi-qubit operations on a universal ion trap quantum computer. In an aspect, a method of performing quantum operations in an ion trap quantum computer or trapped-ion quantum system includes implementing at least two parallel gates of a quantum circuit, each of the at least two parallel gates is a multi-qubit gate, each of the at least two parallel gates is implemented using a different set of ions of a plurality of ions in a ion trap, and the plurality of ions includes four or more ions. The method further includes simultaneously performing operations on the at least two parallel gates as part of the quantum operations. A trapped-ion quantum system and a computer-readable storage medium corresponding to the method described above are also disclosed.

Abstract: A method of performing a computational process using a quantum computer includes generating a laser pulse sequence comprising a plurality of laser pulse segments used to perform an entangling gate operation on a first trapped ion and a second trapped ion of a plurality of trapped ions that are aligned in a first direction, each of the trapped ions having two frequency-separated states defining a qubit, and applying the generated laser pulse sequence to the first and second trapped ions. Each of the plurality of laser pulse segments has a pulse shape with ramps formed using a spline at a start and an end of each of the plurality of laser pulse segments.

Abstract: The disclosure describes aspects of laser cavity repetition rate tuning and high-bandwidth stabilization of pulsed lasers. In one aspect, an output optical coupler is described that includes a cavity output coupler mirror, a piezoelectric actuator coupled to the cavity output coupler mirror, a locking assembly within which the cavity output coupler mirror and the piezoelectric actuator are positioned, and one or more components coupled to the locking assembly. The components are configured to provide multiple positional degrees of freedom for tuning a frequency comb spectrum of the pulsed laser (e.g., tuning a repetition rate) by adjusting at least one position of the locking assembly with the cavity output coupler mirror. A method of adjusting an output optical coupler in a pulsed laser is also described. These techniques may be used in different applications, including quantum information processing.

Abstract: The disclosure describes various aspects of different techniques for flexible touch sensors and method for wide-field imaging of an atom or ion trap. A touch sensor is described for controlling movement of a control element for use with the trap that includes an outer structure and an inner structure that holds the control element and moves within the outer structure. The trap is inside an ultra-high vacuum (UHV) environment and the outer and inner structures are outside the UHV environment and separated by a UHV window. The control element or elements are brought into proximity of the UHV window in connection with controlling targets at the trap. The inner structure can stop moving within the outer structure to avoid damaging of the UHV window with the control element(s) in response to the inner structure being in physical contact with or within a set proximity of the outer structure.

Abstract: Technologies are described herein to track information storage resources in a quantum circuit during compile time or runtime of a program by which quantum algorithms are built.

Abstract: Technologies are described herein to implement quantum hybrid computations. Embodiments include receiving a hybrid program, assigning respective functions corresponding to the hybrid program to either of CPU processing or QPU processing, scheduling processing for the respective functions, initiating execution of the hybrid program, and collating results of the execution of the classical-quantum hybrid program.

Abstract: The disclosure describes various aspects of a shed-resistant thermal atom source. More specifically, a thermal atom source is described for uniform thermal flux of target atomic species in which a metal wadding material is used as an intermediary surface for sublimation of the atoms, preventing the source material from shedding or dropping. In an aspect, a thermal atom source may include a container with closed and open ends, and inside a source material near the closed end and a wadding between the source material and the open end; a heater coupled to the closed end; one or more clamps configured to secure the container and the heater; and a current source coupled to the container and the heater to cause a temperature to increase such that a portion of the source material is released and diffuses to the open end through the wadding prior to being emitted as a flux.

Abstract: The disclosure describes various aspects of acousto-optic modulator (AOM) configurations for quantum processing. A method is described including generating, by a first AOM from a laser beam, first and second diffracted laser beams at different angles based on first and second radio frequency (RF) tones. An optical component focuses the diffracted laser beams onto a second AOM, which generates third and fourth diffracted laser beams based on the first RF tone and a third RF tone and the second RF tone and a fourth RF tone respectively, wherein the third and fourth diffracted laser beams are substantially parallel when incident on a respective ion in a chain of ions in a trap. Quantum information in the ion is controlled to perform quantum processing based on the third and fourth diffracted laser beams. Another method is described including generating, by an AOM, a small polarization rotation of an undiffracted laser beam.

Abstract: The disclosure describes a method, an apparatus, a computer-readable medium, and/or means for reducing two-qubit gates in quantum circuits may include receiving a netlist including information relating to a first plurality of two-qubit quantum gates that form the quantum circuits, performing a controlled gate cancellation operation on the information relating to a first plurality of two-qubit quantum gates to produce a second plurality of two-qubit quantum gates that is functionally equivalent to the first plurality of two-qubit quantum gates, wherein a first number of two-qubit quantum gates in the first plurality of two-qubit quantum gates is larger than a second number of two-qubit quantum gates in the second plurality of two-qubit quantum gates, generating a new netlist containing information about the second plurality of two-qubit quantum gates, and providing the new netlist to implement a functionality of the quantum circuits based on the second plurality of two-qubit quantum gates.

Abstract: The disclosure describes the implementation of automated techniques for optimizing quantum circuits of the size and type expected in quantum computations that outperform classical computers. The disclosure shows how to handle continuous gate parameters and report a collection of fast algorithms capable of optimizing large-scale-scale quantum circuits. For the suite of benchmarks considered, the techniques described obtain substantial reductions in gate counts. In particular, the techniques in this disclosure provide better optimization in significantly less time than previous approaches, while making minimal structural changes so as to preserve the basic layout of the underlying quantum algorithms.

Abstract: Technologies are described herein to compile a Turing-complete quantum programming language program into a quantum circuit. The techniques described and recited herein include compiling TCQPL source code to generate a quantum circuit by generating a function object ensemble, generating an abstract syntax tree from received source code, and annotating nodes corresponding to the abstract syntax tree with corresponding function objects.

Abstract: A computer-implemented method, system and a computer readable medium storing executable instructions for optimizing a quantum circuit are disclosed. The computer-implemented method includes receiving one or more parameters for simulation of evolution of at least one quantum state of a chemical entity to be simulated; generating a quantum circuit for the simulation; performing one or more operations to minimize quantum resources to be used for the generated quantum circuit based on the one or more parameters; and placing quantum resources among one or more elementary logical units (ELUs) based on any one or more of: frequency of occurrence of the quantum resources in the generated quantum circuit, order of occurrence of the quantum resources in the generated quantum circuit, connectivity parameters between one or more quantum resources, efficiency of gates between specific quantum resources, quality of gates between specific quantum resources or a combination thereof.

Abstract: A method of performing a computational process using a quantum computer includes generating a laser pulse sequence comprising a plurality of laser pulse segments used to perform an entangling gate operation on a first trapped ion and a second trapped ion of a plurality of trapped ions that are aligned in a first direction, each of the trapped ions having two frequency-separated states defining a qubit, and applying the generated laser pulse sequence to the first and second trapped ions. Each of the plurality of laser pulse segments has a pulse shape with ramps formed using a spline at a start and an end of each of the plurality of laser pulse segments.

Abstract: A computer-implemented method, system and a computer readable medium storing executable instructions for optimizing a quantum circuit are disclosed. The computer-implemented method includes receiving one or more parameters for simulation of evolution of at least one quantum state of a chemical entity to be simulated; generating a quantum circuit for the simulation; performing one or more operations to minimize quantum resources to be used for the generated quantum circuit based on the one or more parameters; and placing quantum resources among one or more elementary logical units (ELUs) based on any one or more of: frequency of occurrence of the quantum resources in the generated quantum circuit, order of occurrence of the quantum resources in the generated quantum circuit, connectivity parameters between one or more quantum resources, efficiency of gates between specific quantum resources, quality of gates between specific quantum resources or a combination thereof.

Abstract: The disclosure describes various aspects of a tunable, mechanically stable radio-frequency (RF) amplifier. More specifically, the disclosure describes an RF amplifier designed to be tunable and mechanically stable to match and maintain stable driving of an ion trap for quantum processing applications. A precision actuator is used to finely tune the RF amplifier input in a repeatable and mechanically stable way to match the ion trap resonance. Low-loss tangent materials and torch annealing techniques are used to make the amplifier section mechanically stable.

Abstract: A computer-implemented method, system and a computer readable medium storing executable instructions for optimizing a quantum circuit are disclosed. The computer-implemented method includes receiving one or more parameters for simulation of evolution of at least one quantum state of a chemical entity to be simulated; generating a quantum circuit for the simulation; performing one or more operations to minimize quantum resources to be used for the generated quantum circuit based on the one or more parameters; and placing quantum resources among one or more elementary logical units (ELUs) based on any one or more of: frequency of occurrence of the quantum resources in the generated quantum circuit, order of occurrence of the quantum resources in the generated quantum circuit, connectivity parameters between one or more quantum resources, efficiency of gates between specific quantum resources, quality of gates between specific quantum resources or a combination thereof.