Micromachined Integrated Quantum Circuit Containing a Superconducting Qubit

Brecht, T.; Chu, Yiwen; Axline, Christopher; Pfaff, Wolfgang; Blumoff, Jacob; Chou, Kevin; Krayzman, Lev; Frunzio, Luigi; Schoelkopf, Robert

doi:10.1103/physrevapplied.7.044018

Cited by 24 publications

(24 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is a single-piece brass block fabricated using wire electrical discharge machining (EDM) [33,34]. Such a design eliminates seams and therefore their associated loss [35]. Its external dimensions match commercial WR-102 waveguides.…”

Section: Cavity Attenuator Designmentioning

confidence: 99%

Cavity Attenuators for Superconducting Qubits

et al. 2019

View full text Add to dashboard Cite

Dephasing induced by residual thermal photons in the readout resonator is a leading factor limiting the coherence times of qubits in the circuit QED architecture. This residual thermal population, of the order of 10 −1 -10 −3 , is suspected to arise from noise impinging on the resonator from its input and output ports. To address this problem, we designed and tested a new type of band-pass microwave attenuator that consists of a dissipative cavity well thermalized to the mixing chamber stage of a dilution refrigerator. By adding such a cavity attenuator inline with a 3D superconducting cavity housing a transmon qubit, we have reproducibly measured increased qubit coherence times. At base temperature, through Hahn echo experiment, we measured T2e/2T1 = 1.0 (+0.0/−0.1) for two qubits over multiple cooldowns. Through noise-induced dephasing measurement, we obtained an upper bound 2 × 10 −4 on the residual photon population in the fundamental mode of the readout cavity, which to our knowledge is the lowest value reported so far. These results validate an effective method for protecting qubits against photon noise, which can be developed into a standard technology for quantum circuit experiments.

show abstract

Section: Cavity Attenuator Designmentioning

confidence: 99%

Cavity Attenuators for Superconducting Qubits

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Figure 5 shows a concept for a multilayer microwave integrated quantum circuit (MMIQC) [26], which includes vertical interconnects, shielding enclosures, and high-Q storage cavities. Some elements of this concept, such as coupling superconducting qubits to high-Q micromachined cavities, have been demonstrated [29].…”

Section: Mentmentioning

confidence: 99%

Solid-State Qubits: 3D Integration and Packaging

et al. 2020

View full text Add to dashboard Cite

“…by using recent advancements in flip-chip and micromachined superconducting circuit technology [5,43,44].…”

Section: Physical Implementationmentioning

confidence: 99%

Inductively shunted transmon qubit with tunable transverse and longitudinal coupling

et al. 2017

View full text Add to dashboard Cite

We present the design of an inductively shunted transmon qubit with flux-tunable coupling to an embedded harmonic mode. This circuit construction offers the possibility to flux-choose between pure transverse and pure longitudinal coupling, that is, coupling to the σ x or σ z degree of freedom of the qubit. While transverse coupling is the coupling type that is most commonly used for superconducting qubits, the inherently different longitudinal coupling has some remarkable advantages both for readout and for the scalability of a circuit. Being able to choose between both kinds of coupling in the same circuit provides the flexibility to use one for coupling to the next qubit and one for readout, or vice versa. We provide a detailed analysis of the system's behavior using realistic parameters, along with a proposal for the physical implementation of a prototype device.

show abstract

Micromachined Integrated Quantum Circuit Containing a Superconducting Qubit

Cited by 24 publications

References 33 publications

Cavity Attenuators for Superconducting Qubits

Cavity Attenuators for Superconducting Qubits

Solid-State Qubits: 3D Integration and Packaging

Inductively shunted transmon qubit with tunable transverse and longitudinal coupling

Contact Info

Product

Resources

About