Abstract: A method of performing a quantum computation process includes computing first Fourier coefficients of a first pulse function of a first control pulse and second Fourier coefficients of a second pulse function of a second control pulse based on a condition for closure of phase space trajectories and a condition for stabilization of phase-space closure, and computing a first linear combination of the computed first Fourier coefficients and a second linear combination of the computed second Fourier coefficients based on a condition for non-zero degree of entanglement, a condition for stabilization of the degree of entanglement, and a condition for minimized power, applying the first control pulse having the computed first pulse function to a first trapped ion of a pair of trapped ions, and the second control pulse having the computed second pulse function to a second trapped ion of a pair of trapped ions.

Abstract: 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, to systems and methods for providing temperature stabilization of cryogenic setups with radiative load.

Abstract: Aspects of the present disclosure relate generally to systems and methods for use in the implementation and/or operation of preparing photonic integrated circuits (PICs). Specifically, the method include coupling a dicing tape to a first side of a wafer. The method also includes performing a first laser processing step to form a modified layer by applying at least one laser beam of a wavelength that has transmissivity through the wafer along a first projected dicing line to define a first facet and performing a second laser processing step to form the modified layer by applying the at least one laser beam to the wafer along a second projected dicing line to define a second facet. The method further includes expanding the dicing tape to divide the wafer from the modified layer along at least the first projected dicing line and the second projected dicing line into PIC chips.

Abstract: 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, to the use of computational symmetries for error mitigation in quantum computations in QIP systems. In some cases, an example method includes generating a quantum circuit by compiling a quantum program corresponding to a defined quantum computation, generating multiple execution variants of the quantum circuit by applying one or more computation-specific symmetries to the quantum circuit, with the one or more computation-specific symmetries corresponding to the defined quantum computation, causing quantum hardware to execute the multiple execution variants, receiving measurement datasets indicative of computation outputs, and determining a result of the computation by aggregating the measurement datasets.

Abstract: 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, to techniques for optimizing the quantum resources that are used for the calibration of a fully connected quantum processing unit or QPU.

Abstract: 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, including trapped-ion QIP systems. A technique is described in which it is possible to detect at the end of a computational sequence whether an ion has undergone a transition to a state outside a computational subspace, which can only happen because of a spontaneous emission event or other error, referred to as subspace leakage errors. By detecting instances in which the ion finishes the computation outside the computational subspace and subsequently rejecting the results of those specific runs, it is possible to mitigate some or all of the infidelity caused by the subspace leakage errors.

Abstract: Aspects of the present disclosure may include a method and/or a system for applying, to one or more ions in an ion chain, a first light beam having a first polarization and a second light beam having a second polarization to transfer the one or more ions from a first state of a first manifold to a second state of the first manifold, applying, to the one or more ions, the first light beam and the second light beam to transfer the one or more ions from the second state back to the first state, and applying, to the one or more ions, a third light beam to transition the one or more ions from the first state to a third state in a second manifold.

Abstract: Aspects of the present disclosure describe techniques for controlling quantum states of ions in an ion chain for a quantum operation. For example, a method is described that includes providing, from a first direction, a global optical beam to the ions in the ion chain, and providing, from a second direction different from the first direction, to each ion in a subset of the ions in the ion chain, a respective addressing optical beam. The method further includes dynamically controlling each of the addressing optical beams being provided by using a respective channel in a multi-channel acousto-optic modulator (AOM) to implement, with the ion chain, one or more quantum gates in a sequence of quantum gates of the quantum operation. Aspects of a quantum information processing (QIP) system that includes the multi-channel AOM for performing the method are also described.

Abstract: Aspects of the present disclosure may include a method and/or a system for selecting a first ion of the plurality of ions in the ion chain, selecting a second ion of the plurality of ions in the ion chain, applying a first carrier ?/2 pulse to the first ion, applying a first red sideband ? pulse to the first ion, applying a second red sideband ? pulse to the second ion, applying a second carrier ?/2 pulse to the second ion, and scanning a phase of the second carrier ?/2 pulse.

Abstract: 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.

Abstract: A system inputs a training input value into the self-attention head of the transformer model, wherein the training input value is multiplied by three distinct weight matrices to produce a query (Q) vector, a key (K) vector, and a value (V) vector. The system trains a quantum kernel within the self-attention head, wherein quantum kernel is implemented as a parameterized quantum circuit (PQC) with adjustable parameters, and wherein training comprises: encoding the Q vector and the K vector for input into the PQC, generating an output kernel (A) vector; and updating the adjustable parameters of the PQC to reduce a difference between the A vector and a target A vector corresponding to the training input value. The system calculates an output head vector that is a matrix product between the A vector and the V vector. The system outputs, for display, the output head vector.

Abstract: 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, to calibrate compact optical imaging systems that use single atom imaging. A QIP system includes an optical system including an optical relay that receives a beam of light, a housing, and at least one aperture plate. The optical relay includes at least one lens, at least one mirror to fold the beam of light, and a camera sensor to capture at least one image of the beam of light. The housing accommodates the optical relay and includes a slot mechanically referenced to at least one of the lens(es) and the mirror(s). The aperture plate is receivable in the slot. The aperture plate includes an aperture alignable with an optical axis of the optical relay when the aperture plate is received in the slot.

Abstract: Aspects of the present disclosure describe a method including predicting a first set of ansatz terms and a first plurality of amplitudes associated with the first set of ansatz terms; minimizing energy of the system based on the first set of ansatz terms and the first plurality of amplitudes; computing perturbative corrections using one or more ansatz wavefunctions; determining whether energy of the system converges; and predicting, in response to determining that the energy of the system does not converge, a second set of ansatz terms and a second plurality of amplitudes associated with the second set of ansatz terms.

Abstract: The disclosure describes various aspects of different for automated testing of optical assemblies. A system is described that includes an arm (e.g., a motorized arm) configured to be positioned over an optical assembly having a base plate with multiple optical elements that form one or more optical beam paths. The system also includes at least one optical tool that is configured to be removably attached to the arm and has a measurement instrument to perform a specified test on at least one of the optical beam paths. The arm is configured to adjust its position over the optical assembly to move the optical tool to the correct place to perform the specified test. The system may also include an optical tool changer configured to hold the optical tool in a tool holder when not attached to the arm and to hold additional optical tools in respective tool holders.

Abstract: Techniques to address the problem of having micromotion and stray fields affect trapped ions and the operation of QIP systems based on trapped ions are described. For example, one technique or approach may involve collecting scattered photons off the ions using a resonant or near-resonant oscillating electric field (e.g., a laser beam or a microwave source) with some projection in the axis or direction of micromotion that one wishes to reduce. Another technique or approach may include raising and lowering the trapping potentials to see how the ion position changes. The information collected from these techniques may be used to provide appropriate adjustments. Accordingly, the present disclosure describes methods, scripts, or techniques that minimize the effects of micromotion.

Abstract: 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, to a technique for the fabrication of laser-ablation targets used in atomic sources for QIP systems that are based on atomic-based qubits.

Abstract: Aspects of the present disclosure relate to efficiently trapping ions for QIP systems. A system may include an ablation laser beam source and an ion trapping structure including: an enclosure with an orifice, a source material that is arranged in the enclosure and receives an ablation laser pulse to provide a plume of atoms. A system may include at least one LED that is arranged in the enclosure and onto which at least a portion of the plume of atoms is deposited, wherein the at least one LED is configured to emit light that desorbs at least one deposited atom through the orifice. A system may include an ion trap with a gap through which the at least one deposited atom desorbed travels from the orifice, and a laser beam source configured to generate a laser beam towards the at least one deposited atom creating a trapped ion.

Abstract: Aspects of the present disclosure describe techniques for using a parabolic Cassegrain-type reflector for ablation. For example, a system for ablation loading of a trap is described that includes a reflector having a hole aligned with a loading aperture of the trap, and an atomic source positioned at a focal point of the reflector, where one or more laser beams are reflected from a reflective front side of the reflector and focused on a surface of the atomic source to produce an atomic plume, and the atomic plume once produced passing through the hole in the reflector and through a loading aperture of the trap for loading the trap. A method for ablation loading of a trap within a chamber in a trapped ion system is also described.

Abstract: 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. To optimize the performance of QIP systems or quantum computers in terms of both fidelity and algorithm uptime or throughput, described are techniques to stabilize continuous and discrete errors from drifting and/or noisy secondary observables to achieve long term stable operation.

Abstract: Aspects of the present disclosure describe a method including compressing and uncompressing redundant quantum information encoded in quantum computers; processing quantum information in the compressed space; and computing, in response to determining the ansatz terms, a set of optimal transformations.