Hardware for dynamic quantum computing

Ryan, Colm A.; Johnson, Blake; Ristè, Diego; Donovan, Brian F.; Ohki, Thomas A.

doi:10.1063/1.5006525

Cited by 79 publications

(57 citation statements)

References 41 publications

(51 reference statements)

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“…However, many laboratories use software platforms developed in-house, often due to the concurrent development of custom-built, highly specialized electronics and FPGA circuits (many of these developments are not always published, but readers may consult Refs. 189,190, and 418 for three examples). There is currently also a large ongoing development of quantum circuit simulation and compiling software packages.…”

Section: Discussionmentioning

confidence: 99%

A quantum engineer's guide to superconducting qubits

Krantz

Kjærgaard

Yan

et al. 2019

Applied Physics Reviews

1,454

962

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The aim of this review is to provide quantum engineers with an introductory guide to the central concepts and challenges in the rapidly accelerating field of superconducting quantum circuits. Over the past twenty years, the field has matured from a predominantly basic research endeavor to one that increasingly explores the engineering of larger-scale superconducting quantum systems. Here, we review several foundational elements -qubit design, noise properties, qubit control, and readout techniques -developed during this period, bridging fundamental concepts in circuit quantum electrodynamics (cQED) and contemporary, stateof-the-art applications in gate-model quantum computation.

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Section: Discussionmentioning

confidence: 99%

A quantum engineer's guide to superconducting qubits

Krantz

Kjærgaard

Yan

et al. 2019

Applied Physics Reviews

1,454

962

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“…To be more precise, in the conventional approach for control-pulse synthesis AWGs only generate a baseband signal and a desired pulse is then obtained through an upconversion to microwave frequencies by mixing with a carrier. However, the continuously improving sampling rates of AWGs -currently approaching 100 gigasamples per second -now allow direct digital synthesis of microwave pulses [40], thus obviating the need for separate microwave generators. Thus, these high-bandwidth AWGs both allow more advanced pulse shaping and reduce the number of hardware components in QC setups.…”

Section: B Physical Realizationsmentioning

confidence: 99%

Feasibility of single-shot realizations of conditional three-qubit gates in exchange-coupled qubit arrays with local control

Stojanović

2019

Phys. Rev. A

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We investigate the feasibility of single-shot Toffoli-and Fredkin-gate realizations in qubit arrays with Heisenberg-type exchange interactions between adjacent qubits. As follows from the Liealgebraic criteria of controllability, such an array is rendered completely controllable -equivalent to allowing universal quantum computation -by a Zeeman-like control field with two orthogonal components acting on a single "actuator" qubit. Adopting this local-control setting, we start our analysis with piecewise-constant control fields and determine the global maxima of the relevant figure of merit (target-gate fidelity) by combining the multistart-based clustering algorithm and quasi-Newton type local optimization. We subsequently introduce important practical considerations, such as finite frequency bandwidth of realistic fields and their leakage away from the actuator. We find the shortest times required for high-fidelity Toffoli-and Fredkin-gate realizations and provide comparisons to their respective two-qubit counterparts -controlled-NOT and exponential-SWAP. In particular, the Toffoli-gate time compares much more favorably to that of controlled-NOT than in the standard decomposition-based approach. This study indicates that the use of the single-shot approach can alleviate the burden on control-generating hardware in future experimental realizations of multi-qubit gates.

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“…A more optimized version of the code is currently under development which we plan to open source to the community. [50]. Gate instructions are converted to control pulses and sent to the five-qubit device.…”

Section: Appendix C: Experimental Methodsmentioning

confidence: 99%

“…Gatestrings are generated with pyGSTi [48], transpiled into our QGL [49] language and finally compiled to a hardware specific format for our custom APS2 arbitrary waveform generators [50]. To insure each GST experiment (across all three pairs) is subject to the same environmental noise on average, and as consistent as possible with other experiments, gatestrings from the three sets are interleaved on a shot-by-shot basis before being exe- cuted.…”

Section: Experimental Reconstructionsmentioning

confidence: 99%

Bootstrapping quantum process tomography via a perturbative ansatz

Govia¹,

Ribeill²,

Ristè³

et al. 2020

Nat Commun

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Quantum process tomography has become increasingly critical as the need grows for robust verification and validation of candidate quantum processors. Here, we present an approach for efficient quantum process tomography that uses a physically motivated ansatz for an unknown quantum process. Our ansatz bootstraps to an effective description for an unknown process on a multi-qubit processor from pairwise two-qubit tomographic data. Further, our approach can inherit insensitivity to system preparation and measurement error from the two-qubit tomography scheme. We benchmark our approach using numerical simulation of noisy three-qubit gates, and show that it produces highly accurate characterizations of quantum processes. Further, we demonstrate our approach experimentally, building three-qubit gate reconstructions from two-qubit tomographic data.

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Hardware for dynamic quantum computing

Cited by 79 publications

References 41 publications

A quantum engineer's guide to superconducting qubits

A quantum engineer's guide to superconducting qubits

Feasibility of single-shot realizations of conditional three-qubit gates in exchange-coupled qubit arrays with local control

Bootstrapping quantum process tomography via a perturbative ansatz

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