General purpose multiplexing device for cryogenic microwave systems

Chapman, Benjamin J.; Moores, Bradley A.; Rosenthal, Eric I.; Kerckhoff, Joseph; Lehnert, K. W.

doi:10.1063/1.4952772

Cited by 30 publications

(24 citation statements)

References 32 publications

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“…[22]. More sophisticated on-chip input/output circuitry, such as quantum limited amplifiers [23][24][25], circulators [26,27], and switching elements [28,29], will also be required for practical quantum information processing. This integration will likely be accompanied by through-wafer metalized vias to prevent cross-talk.…”

Section: Discussionmentioning

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: Discussionmentioning

confidence: 99%

Micromachined Integrated Quantum Circuit Containing a Superconducting Qubit

et al. 2017

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“…[21]. More sophisticated on-chip input/output circuitry, such as quantum limited amplifiers [22][23][24], circulators [25,26], and switching elements [27,28], will also be required for practical quantum information processing. We anticipate that the techniques demonstrated here can be successfully employed toward integrating these elements into increasingly complex MMIQCs.…”

Section: Discussionmentioning

confidence: 99%

Erratum: Micromachined Integrated Quantum Circuit Containing a Superconducting Qubit [Phys. Rev. Applied 7 , 044018 (2017)]

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 finally 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 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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“…As the imbalance in the bridge determines its transmission, changing δ allows the circuit to act as a switch or a multiplying element [37,38]. The bridge circuit's tunable inductors are realized with series arrays of superconducting quantum interference devices (SQUIDs), formed by the parallel arrangement of two Josephson junctions.…”

Section: A Multiplying Elementsmentioning

confidence: 99%

Widely Tunable On-Chip Microwave Circulator for Superconducting Quantum Circuits

et al. 2017

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We report on the design and performance of an on-chip microwave circulator with a widely (GHz) tunable operation frequency. Nonreciprocity is created with a combination of frequency conversion and delay, and requires neither permanent magnets nor microwave bias tones, allowing on-chip integration with other superconducting circuits without the need for high-bandwidth control lines. Isolation in the device exceeds 20 dB over a bandwidth of tens of MHz, and its insertion loss is small, reaching as low as 0.9 dB at select operation frequencies. Furthermore, the device is linear with respect to input power for signal powers up to hundreds of fW (≈10 3 circulating photons), and the direction of circulation can be dynamically reconfigured. We demonstrate its operation at a selection of frequencies between 4 and 6 GHz.

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General purpose multiplexing device for cryogenic microwave systems

Cited by 30 publications

References 32 publications

Micromachined Integrated Quantum Circuit Containing a Superconducting Qubit

Micromachined Integrated Quantum Circuit Containing a Superconducting Qubit

Erratum: Micromachined Integrated Quantum Circuit Containing a Superconducting Qubit [Phys. Rev. Applied 7 , 044018 (2017)]

Widely Tunable On-Chip Microwave Circulator for Superconducting Quantum Circuits

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