High-fidelity three-qubit iToffoli gate for fixed-frequency superconducting qubits

Kim, Yosep; Morvan, Alexis; Nguyen, Long B.; Naik, Ravi; Jünger, Christian; Chen, Larry; Kreikebaum, John Mark; Santiago, David I.; Siddiqi, Irfan

doi:10.1038/s41567-022-01590-3

Cited by 61 publications

(38 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An effective strategy is to fully explore the hardware capabilities and diversify the available gate alphabets to optimize compilation. Recent progress on continuous gate set, multi-qubit gates, and qudit operations have shown considerable potential in this respect [275,[300][301][302][303][304]. ) is many orders of magnitude higher than that a logical qubit would require ( -), QEC is necessary for building a universal quantum computer.…”

Section: /Fmentioning

confidence: 99%

Noisy intermediate-scale quantum computers

Cheng

Deng

et al. 2023

Front. Phys.

View full text Add to dashboard Cite

Quantum computers have made extraordinary progress over the past decade, and significant milestones have been achieved along the path of pursuing universal fault-tolerant quantum computers. Quantum advantage, the tipping point heralding the quantum era, has been accomplished along with several waves of breakthroughs. Quantum hardware has become more integrated and architectural compared to its toddler days. The controlling precision of various physical systems is pushed beyond the fault-tolerant threshold. Meanwhile, quantum computation research has established a new norm by embracing industrialization and commercialization. The joint power of governments, private investors, and tech companies has significantly shaped a new vibrant environment that accelerates the development of this field, now at the beginning of the noisy intermediate-scale quantum era. Here, we first discuss the progress achieved in the field of quantum computation by reviewing the most important algorithms and advances in the most promising technical routes, and then summarizing the next-stage challenges. Furthermore, we illustrate our confidence that solid foundations have been built for the fault-tolerant quantum computer and our optimism that the emergence of quantum killer applications essential for human society shall happen in the future.

show abstract

Section: /Fmentioning

confidence: 99%

Noisy intermediate-scale quantum computers

Cheng

Deng

et al. 2023

Front. Phys.

View full text Add to dashboard Cite

show abstract

“…Taking realistic values for qubit and coupler coherence times into account we expect an added gate error below 1 %. By directly utilizing the strong qubit-coupler interactions and a flexible pulse scheme the proposed CCPHASE gate has the potential to improve both speed and fidelity as compared to stateof-the-art implementations and proposals of three-qubit gates on superconducting qubits [25,[27][28][29]. Moreover, the studied three-qubit coupler refocusing scheme allows for the implementation of pairwise controlled-phase gates with adjustable phases, thus providing greater connectivity and flexibility in comparison to two-qubit couplers.…”

Section: Discussion and Outlookmentioning

confidence: 99%

“…The challenge is, however, to design multi-qubit operations that are fast and accurate when compared to an equivalent two-qubit gate decomposition, to avoid decoherence and reach high fidelities. For superconducting qubit archi-tectures, several techniques for implementing multi-qubit operations have been investigated, e.g., utilizing noncomputational qutrit states to implement more efficient digital decompositions [13,[24][25][26], applying simultaneous pairwise couplings to generate effective multi-qubit interactions [27][28][29][30][31] or introducing a shared coupling element acting as a multi-qubit coupler [32][33][34][35][36]. Each approach comes with its specific advantages and challenges.…”

Section: Introductionmentioning

confidence: 99%

Controlled-controlled-phase gates for superconducting qubits mediated by a shared tunable coupler

Glaser¹,

Roy²,

Filipp³

2022

Preprint

View full text Add to dashboard Cite

“…Leaving aside the extra resources needed, it is challenging to achieve high-quality small Toffoli gates. Apart from brute-force decomposition, small Toffoli gates may be obtained via one-step manipulations [17][18][19][20][21][22][23] or by leveraging either, again, ancilla qubits 24,25 or ancilla levels [26][27][28][29][30] . Despite successful demonstrations of single small Toffoli gates in Both can be synthesized with a single-qubit X gate and an iSWAP-like operation between |11⟩ and |20⟩, which is indicated by a double-cross sign with a dashed cross on the child qubit.…”

Section: Simplifying Quantum Logic Using Quand Gatesmentioning

confidence: 99%

Scalable algorithm simplification using quantum AND logic

Chu¹,

He²,

Zhou³

et al. 2022

Nat. Phys.

View full text Add to dashboard Cite

Implementing quantum algorithms on realistic devices requires translating high-level global operations into sequences of hardware-native logic gates, a process known as quantum compiling. Physical limitations, such as constraints in connectivity and gate alphabets, often result in unacceptable implementation costs. To enable successful near-term applications, it is crucial to optimize compilation by exploiting the capabilities of existing hardware. Here we implement a resource-efficient construction for a quantum version of AND logic that can reduce the compilation overhead, enabling the execution of key quantum circuits. On a high-scalability superconducting quantum processor, we demonstrate low-depth synthesis of high-fidelity generalized Toffoli gates with up to 8 qubits and Grover’s search algorithm in a search space of up to 64 entries. Our experimental demonstration illustrates a scalable and widely applicable approach to implementing quantum algorithms, bringing more meaningful quantum applications on noisy devices within reach.

show abstract

High-fidelity three-qubit iToffoli gate for fixed-frequency superconducting qubits

Cited by 61 publications

References 43 publications

Noisy intermediate-scale quantum computers

Noisy intermediate-scale quantum computers

Controlled-controlled-phase gates for superconducting qubits mediated by a shared tunable coupler

Scalable algorithm simplification using quantum AND logic

Contact Info

Product

Resources

About