Planar Multilayer Circuit Quantum Electrodynamics

Minev, Zlatko K.; Serniak, Kyle; Pop, I.; Leghtas, Zaki; Sliwa, K.M.; Hatridge, Michael; Frunzio, Luigi; Schoelkopf, Robert; Devoret, Michel

doi:10.1103/physrevapplied.5.044021

Cited by 35 publications

(35 citation statements)

References 48 publications

(83 reference statements)

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“…[11]. In the device of the present work, the coupling can be understood by analyzing the overlap between the electric fields of the transmon mode and those of the adjacent cavity mode(s), and also by an equivalent circuit model.…”

Section: Qubit-resonator Couplingmentioning

confidence: 99%

Micromachined Integrated Quantum Circuit Containing a Superconducting Qubit

et al. 2017

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We present a device demonstrating a lithographically patterned transmon integrated with a micromachined cavity resonator. Our two-cavity, one-qubit device is a multilayer microwave integrated quantum circuit (MMIQC), comprising a basic unit capable of performing circuit-QED (cQED) operations. We describe the qubit-cavity coupling mechanism of a specialized geometry using an electric field picture and a circuit model, and obtain specific system parameters using simulations. Fabrication of the MMIQC includes lithography, etching, and metallic bonding of silicon wafers. Superconducting wafer bonding is a critical capability that is demonstrated by a micromachined storage cavity lifetime of 34.3 µs, corresponding to a quality factor of 2 million at single-photon energies. The transmon coherence times are T1 = 6.4 µs, and T Echo 2 = 11.7 µs. We measure qubit-cavity dispersive coupling with rate χqµ/2π = −1.17 MHz, constituting a Jaynes-Cummings system with an interaction strength g/2π = 49 MHz. With these parameters we are able to demonstrate cQED operations in the strong dispersive regime with ease. Finally, we highlight several improvements and anticipated extensions of the technology to complex MMIQCs.

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Section: Qubit-resonator Couplingmentioning

confidence: 99%

Micromachined Integrated Quantum Circuit Containing a Superconducting Qubit

et al. 2017

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“…There are many options for breaking this 'third dimension' ,which include standard silicon-based lithographic techniques such as thru-silicon-vias, a flip-chip multi layer stack, or employing waveguide package resonance modes. 89 Ultimately, the solution must also be cryogenically compatible, preserve coherence times and gate fidelities, while not also introducing any new loss mechanisms.…”

Section: Technical Challenges Aheadmentioning

confidence: 99%

Building logical qubits in a superconducting quantum computing system

Gambetta¹,

Chow²,

Steffen³

2017

npj Quantum Inf

400

320

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The technological world is in the midst of a quantum computing and quantum information revolution. Since Richard Feynman's famous 'plenty of room at the bottom' lecture (Feynman, Engineering and Science 23, 22 (1960)), hinting at the notion of novel devices employing quantum mechanics, the quantum information community has taken gigantic strides in understanding the potential applications of a quantum computer and laid the foundational requirements for building one. We believe that the next significant step will be to demonstrate a quantum memory, in which a system of interacting qubits stores an encoded logical qubit state longer than the incorporated parts. Here, we describe the important route towards a logical memory with superconducting qubits, employing a rotated version of the surface code. The current status of technology with regards to interconnected superconducting-qubit networks will be described and near-term areas of focus to improve devices will be identified. Overall, the progress in this exciting field has been astounding, but we are at an important turning point, where it will be critical to incorporate engineering solutions with quantum architectural considerations, laying the foundation towards scalable fault-tolerant quantum computers in the near future. 1-3 Loosely speaking, quantum computing targets problems that can exploit entanglement to explore correlations in computations, then selects the correct answer through constructive interference. For example, Shor's algorithm addresses the computational challenge of factoring by exploiting quantum interference to measure the periodicity of arithmetic objects.

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“…21 Some of theses issues have been addressed already and have shown promising results. [27][28][29][30] We report the design of a 3D-lumped element microwave cavity in order to ensure large and homogeneous single spin Rabi frequencies. In combination with inhomogeneous broadening of the spin ensemble, 31 for which we can account for using spin-echo refocusing techniques, an inhomogeneous field distribution throughout the sample prohibits the uniform and coherent manipulation of a spin ensemble.…”

mentioning

confidence: 99%

Collective strong coupling with homogeneous Rabi frequencies using a 3D lumped element microwave resonator

Angerer

Astner

Wirtitsch

et al. 2016

Applied Physics Letters

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We design and implement 3D lumped element microwave cavities for the coherent and uniform coupling to electron spins hosted by nitrogen vacancy centers in diamond.Our design spatially focuses the magnetic field to a small mode volume. We achieve large homogeneous single spin coupling rates, with an enhancement of the single spin Rabi frequency of more than one order of magnitude compared to standard 3D cavities with a fundamental resonance at 3 GHz. Finite element simulations confirm that the magnetic field component is homogeneous throughout the entire sample volume, with a RMS deviation of 1.54%. With a sample containing 10 17 nitrogen vacancy electron spins we achieve a collective coupling strength of Ω = 12 MHz, a cooperativity factor C = 27 and clearly enter the strong coupling regime. This allows to interface a macroscopic spin ensemble with microwave circuits, and the homogeneous Rabi frequency paves the way to manipulate the full ensemble population in a coherent way.

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Planar Multilayer Circuit Quantum Electrodynamics

Cited by 35 publications

References 48 publications

Micromachined Integrated Quantum Circuit Containing a Superconducting Qubit

Micromachined Integrated Quantum Circuit Containing a Superconducting Qubit

Building logical qubits in a superconducting quantum computing system

Collective strong coupling with homogeneous Rabi frequencies using a 3D lumped element microwave resonator

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