Correlated charge noise and relaxation errors in superconducting qubits

Wilen, Christopher D.; Abdullah, Syahrul Afzal Che; Kurinsky, Noah; Stanford, C.; Cardani, L.; D'imperio, Giulia; Tomei, C.; Faoro, Lara; Ioffe, L. B.; Liu, Chuan-Hong; Opremcak, Alex; Christensen, Barbara L.; Dubois, Jonathan; McDermott, Robert

doi:10.1038/s41586-021-03557-5

Cited by 152 publications

(124 citation statements)

References 34 publications

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“…Recent work has pointed to high-energy ionizing radiation 123 , specifically keV muons and MeV gamma rays, as a source of quasiparticles. 11,58 Such impacts can have correlated noise effects on a group of nearby qubits, 124 and can also fuel a slow cascade of energy relaxation over long time intervals; these effects are particularly harmful if they create correlated errors that cannot be compensated by quantum error correction 125 . Thus, best practices to improve coherence include increased shielding, which at infrared frequencies involves effective cryopackaging and nested radiation shields.…”

Section: [H3] Trapping Structuresmentioning

confidence: 99%

Engineering high-coherence superconducting qubits

Siddiqi

2021

Nat Rev Mater

127

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Advances in materials science and engineering have played a central role in the development of classical computers, and will undoubtedly be critical in propelling the maturation of quantum information technologies. In approaches to quantum computation based on superconducting circuits, as one goes from bulk materials to functional devices, amorphous insulating films and nonequilibrium excitations-electronic and phononic-are introduced, leading to dissipation and fluctuations that limit the computational power of state-of-the-art qubits and processors. In this Review, the major sources of decoherence in superconducting qubits are identified through an exploration of seminal qubit and resonator experiments. The proposed microscopic mechanisms associated with these imperfections are summarized, and directions for future research are discussed. The trade-offs between simple qubit primitives based on a single Josephson tunnel junction and more complex designs that use additional circuit elements, or new junction modalities, to reduce sensitivity to local noise sources are discussed, particularly in the context of materials optimization strategies for each architecture.

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Section: [H3] Trapping Structuresmentioning

confidence: 99%

Engineering high-coherence superconducting qubits

Siddiqi

2021

Nat Rev Mater

127

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“…In this case we can approximate T ~ 10 1 mK, corresponding to a timescale of 1 ns. Experimentally, one can deliberately build superconducting qubits sensitive to charge noise 48 so that QPS effects become measurable.…”

Section: Resultsmentioning

confidence: 99%

Intrinsic and induced quantum quenches for enhancing qubit-based quantum noise spectroscopy

Wang

Clerk

2021

Nat Commun

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Quantum sensing protocols that exploit the dephasing of a probe qubit are powerful and ubiquitous methods for interrogating an unknown environment. They have a variety of applications, ranging from noise mitigation in quantum processors, to the study of correlated electron states. Here, we discuss a simple strategy for enhancing these methods, based on the fact that they often give rise to an inadvertent quench of the probed system: there is an effective sudden change in the environmental Hamiltonian at the start of the sensing protocol. These quenches are extremely sensitive to the initial environmental state, and lead to observable changes in the sensor qubit evolution. We show how these new features give access to environmental response properties. This enables methods for direct measurement of bath temperature, and for detecting non-thermal equilibrium states. We also discuss how to deliberately control and modulate this quench physics, which enables reconstruction of the bath spectral function. Extensions to non-Gaussian quantum baths are also discussed, as is the application of our ideas to a range of sensing platforms (e.g., nitrogen-vacancy (NV) centers in diamond, semiconductor quantum dots, and superconducting circuits).

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“…(3) 由于屏蔽不充分, 宇宙射线、红外光照射到量子芯片, 会破坏超导材料中库珀对, 形成非平衡态粒子 [51] , 通常为电子型和空穴型Bogoliubov准粒子 [52] . 准粒子在约瑟夫森结隧穿, 会导致能量退相干.…”

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