Quantum computing hardware for HEP algorithms and sensing

Alam, M. Sohaib; Belomestnykh, S.; Bornman, Nicholas; Cancelo, Gustavo; Chao, Yu‐Chiu; Checchin, Mattia; Dinh, Vinh San; Gustafson, Erik; Harnik, Roni; McRae, Corey Rae; Huang, Ziwen; Kapoor, Keshav; Kim, Taeyoon; Kowalkowski, Jim; Kramer, M. J.; Krasnikova, Yulia; Kumar, Prem; Kürkçüoğlu, Doğa Murat; Lamm, Henry; Lyon, A. L.; Milathianaki, Despina; Murthy, Akshay A.; Mutus, J.; Nekrashevich, I. G.; Oh, Jin‐Su; Özgüler, A. Barış; Perdue, G. N.; Reagor, Matthew; Romanenko, Alexander; Sauls, J. A.; Stefanazzi, Leandro; Venturelli, Davide; You, Xinyuan; Zanten, D. M. T. van; Zhang, Lin; Zhu, Shaojiang; Zorzetti, Silvia

doi:10.48550/arxiv.2204.08605

Cited by 7 publications

(11 citation statements)

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“…(2) Reducing the substrate thickness may help to improve heat sinking when transmons are in a vacuum. (3) The most problematic aspect of these films is that their granular structure may be fixed by switching to a different deposition method. The alternative methods producing better Nb films have been known since the 1980s [55,56].…”

Section: A Suggested Mitigation Strategiesmentioning

confidence: 99%

“…Superconducting qubits are promising candidates for implementing large-scale quantum computers [1][2][3]. The advancement in fabrication and design of superconducting qubits have demonstrated impressive gate fidelity of up to 99.5 % for two-qubit gates, which is the measure of the ability of a device to faithfully execute quantum algorithms [4].…”

Section: Introductionmentioning

confidence: 99%

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Quasiparticle spectroscopy, transport, and magnetic properties of Nb films used in superconducting transmon qubits

Joshi¹,

Ghimire²,

Tanatar³

et al. 2022

Preprint

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Niobium thin films on silicon substrate used in the fabrication of superconducting qubits have been characterized using scanning and transmission electron microscopy, electrical transport, magnetization, quasiparticle spectroscopy, and real-space real-time magneto-optical imaging. We study niobium films to provide an example of a comprehensive analytical set that may benefit superconducting circuits such as those used in quantum computers. The films show outstanding superconducting transition temperature of Tc = 9.35 K and a fairly clean superconducting gap, along with superfluid density enhanced at intermediate temperatures. These observations are consistent with the recent theory of anisotropic strong-coupling superconductivity in Nb. However, the response to the magnetic field is complicated, exhibiting significantly irreversible behavior and insufficient heat conductance leading to thermo-magnetic instabilities. These may present an issue for further improvement of transmon quantum coherence. Possible mitigation strategies are discussed.

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Section: A Suggested Mitigation Strategiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quasiparticle spectroscopy, transport, and magnetic properties of Nb films used in superconducting transmon qubits

Joshi¹,

Ghimire²,

Tanatar³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…( 11)) could be viable but its practical implementation will likely suffer from the aforementioned quantum and classical crosstalk problems whose handling is currently one of the main active research topics of the 3D multimode cQED domain [42]. Even assuming that the bandwidth of the control pulses and the level spacing has sufficient resolution, there is a need for the co-design of a NISQ cQED architecture that would allow two-mode gates to operate in large Hilbert space with a controllable effect over spectator modes that are subject to an always-on interaction [43]. Theory results on quantum adiabatic protocols [44,45] on bosonic systems could provide an initial reference point to be generalized [46,47].…”

Section: Realistic Implementationmentioning

confidence: 99%

Numerical gate synthesis for quantum heuristics on bosonic quantum processors

Özgüler

Venturelli

2022

Front. Phys.

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There is a recent surge of interest and insights regarding the interplay of quantum optimal control and variational quantum algorithms. We study the framework in the context of qudits which are, for instance, definable as controllable electromagnetic modes of a superconducting cavity system coupled to a transmon. By employing recent quantum optimal control approaches described in (Petersson and Garcia, 2021), we showcase control of single-qudit operations up to eight states, and two-qutrit operations, mapped respectively onto a single mode and two modes of the resonator. We discuss the results of numerical pulse engineering on the closed system for parametrized gates useful to implement Quantum Approximate Optimization Algorithm (QAOA) for qudits. The results show that high fidelity (> 0.99) is achievable with sufficient computational effort for most cases under study, and extensions to multiple modes and open, noisy systems are possible. The tailored pulses can be stored and used as calibrated primitives for a future compiler in circuit quantum electrodynamics (cQED) systems.

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“…Three-dimensional bulk niobium superconducting cavities provide opportunities to mitigate quantum decoherence mechanisms [40][41][42][43] . Such cavities developed at Fermilab for particle accelerators exhibit record-long photon lifetime at milli-Kelvin (mK) temperature and thus mitigate the loss of microwave photons and greatly enhance light-matter interaction in the quantum regime.…”

Section: Introductionmentioning

confidence: 99%

High-efficiency microwave-optical quantum transduction based on a cavity electro-optic superconducting system with long coherence time

et al. 2022

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Frequency conversion between microwave and optical photons is a key enabling technology to create links between superconducting quantum processors and to realize distributed quantum networks. We propose a microwave-optical transduction platform based on long-coherence time superconducting radio-frequency (SRF) cavities coupled to electro-optic optical cavities to mitigate the loss mechanisms that limit the attainment of high conversion efficiency. We optimize the microwave-optical field overlap and optical coupling losses in the design while achieving long microwave and optical photon lifetime at milli-Kelvin temperatures. This represents a significant enhancement of the transduction efficiency up to 50% under incoming pump power of 140 μW, which allows the conversion of few-photon quantum signals. Furthermore, this scheme exhibits high resolution for optically reading out the dispersive shift induced by a superconducting transmon qubit coupled to the SRF cavity. We also show that low microwave losses enhance the fidelity of heralded entanglement generation between two remote quantum systems. Finally, high precision in quantum sensing can be reached below the standard quantum limit.

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Quantum computing hardware for HEP algorithms and sensing

Cited by 7 publications

References 0 publications

Quasiparticle spectroscopy, transport, and magnetic properties of Nb films used in superconducting transmon qubits

Quasiparticle spectroscopy, transport, and magnetic properties of Nb films used in superconducting transmon qubits

Numerical gate synthesis for quantum heuristics on bosonic quantum processors

High-efficiency microwave-optical quantum transduction based on a cavity electro-optic superconducting system with long coherence time

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