Flux-tunable heat sink for quantum electric circuits

Partanen, Matti; Tan, Kuan Yen; Masuda, S.; Govenius, Joonas; Lake, Russell; Jenei, Máté; Grönberg, Leif; Hassel, Juha; Simbierowicz, Slawomir; Vesterinen, Visa; Tuorila, Jani; Ala-Nissilä, Tapio; Möttönen, Mikko

doi:10.1038/s41598-018-24449-1

Cited by 36 publications

(51 citation statements)

References 45 publications

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“…Note that we use in Fig. 1(b) a relatively strong environmental coupling, κ = 0.2 × ω q , as realized in recent protocols for engineered environments [13][14][15] . This is outside the strict applicability of the LE.…”

Section: Decay Dynamicsmentioning

confidence: 99%

System-environment correlations in qubit initialization and control

Tuorila

Stockburger

Ala-Nissilä

et al. 2019

Phys. Rev. Research

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The impressive progress in fabricating and controlling superconducting devices for quantum information processing has reached a level where reliable theoretical predictions need to account for quantum correlations that are not captured by the conventional modeling of contemporary quantum computers. This applies particularly to the qubit initialization as the process which crucially limits typical operation times. Here we employ numerically exact methods to study realistic implementations of a transmon qubit embedded in electromagnetic environments focusing on the most important system-reservoir correlation effects such as the Lamb shift and entanglement. For the qubit initialization we find a fundamental trade-off between speed and accuracy which sets intrinsic constraints in the optimization of future reset protocols. Instead, the fidelities of quantum logic gates can be sufficiently accurately predicted by standard treatments. Our results can be used to accurately predict the performance of specific set-ups and also to guide future experiments in probing low-temperature properties of qubit reservoirs.

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Section: Decay Dynamicsmentioning

confidence: 99%

System-environment correlations in qubit initialization and control

Tuorila

Stockburger

Ala-Nissilä

et al. 2019

Phys. Rev. Research

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“…In superconducting circuits, normal metal elements can be easily integrated into the existing chip architecture, and provide channels for intentional decoherence, such as for quantum bit initialization [11][12][13] , for precise temperature control (electronic heating and cooling) 18,19 , ultra sensitive calorimetry 20 . Notably, these devices are in use as high-speed thermometers and microwave photon sources 21,22 .…”

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confidence: 99%

Utilization of the superconducting transition for characterizing low-quality-factor superconducting resonators

Chang

Karimi

Senior

et al. 2019

Applied Physics Letters

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Characterizing superconducting microwave resonators with highly dissipative elements is a technical challenge, but a requirement for implementing and understanding the operation of hybrid quantum devices involving dissipative elements, e.g. for thermal engineering and detection. We present experiments on λ/4 superconducting niobium coplanar waveguide (CPW) resonators, terminating at the antinode by a dissipative copper microstrip via aluminum leads, such that the resonator response is difficult to measure in a typical microwave environment. By measuring the transmission both above and below the superconducting transition of aluminum, we are able to isolate the resonance. We then experimentally verify this method with copper microstrips of increasing thicknesses, from 50 nm to 150 nm, and measure quality factors in the range of 10 ∼ 67 in a consistent way. arXiv:1904.01781v2 [cond-mat.supr-con]

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“…We also note that a circuit dissipator formed with a low quality resonator has been studied in Ref. [13], and that a dissipator formed by Josephson junction chains was proposed in Ref. [14] In addition to resonator reset, the circuit proposed here could be used to study driven-dissipative phase transitions of coupled nonlinear oscillators [15] and for quantum bath engineering [16,17].…”

Section: Introductionmentioning

confidence: 94%

A tunable quantum dissipator for active resonator reset in circuit QED

Wong

Wilen

McDermott

et al. 2019

Quantum Sci. Technol.

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We propose a method for fast, deterministic resonator reset based on tunable dissipative modes. The dissipator is based on a Josephson junction with relatively low quality factor. When the dissipator is tuned into resonance with a high quality microwave resonator, resonator photons are absorbed by the dissipator at a rate orders of magnitude faster than the resonator relaxation rate. We determine the optimal parameters for realization of the tunable dissipator, and examine application of the dissipator to removing spurious photon population in the qubit readout resonator in circuit quantum electrodynamics. We show that even in the nonlinear large photon occupation regime, this enhanced resonator decay rate can be attained by appropriate modulation of the dissipator frequency.arXiv:1806.01880v3 [cond-mat.mes-hall]

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Flux-tunable heat sink for quantum electric circuits

Cited by 36 publications

References 45 publications

System-environment correlations in qubit initialization and control

System-environment correlations in qubit initialization and control

Utilization of the superconducting transition for characterizing low-quality-factor superconducting resonators

A tunable quantum dissipator for active resonator reset in circuit QED

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