Widely tunable parametric amplifier based on a superconducting quantum interference device array resonator

Castellanos-Beltran, Manuel; Lehnert, K. W.

doi:10.1063/1.2773988

Cited by 370 publications

(418 citation statements)

References 14 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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“…We note that, in practice, the smaller nonlinearity (dashed gray line) is obtained using junction arrays. Indeed, the Kerr nonlinearity with a junction array is inversely proportional to the square of the number of junctions in the array [4,9].…”

Section: A Deviation From Standard Dpa Resultsmentioning

confidence: 99%

“…Second, our results illustrate clearly the value of designing JPAs with small Kerr nonlinearities. This can be obtained by using SQUID arrays to dilute the nonlinearity [4,9] or adding additional linear inductance [36]. Finally, our work emphasizes the phase-sensitivity of the JPA in the high gain regime, and the importance of fully characterizing the phase and frequency dependence of the gain matrix in order to operate at the optimal phases and frequencies where the effects of nonidealities are minimal.…”

Section: Discussionmentioning

confidence: 99%

“…Following the path of Yurke's et al work in the late 1980s [1][2][3], several designs of Josephson junction-based parametric amplifiers (JPAs) have been introduced [4][5][6][7][8][9][10][11]. In addition to high-fidelity superconducting qubit readout leading to the observation of quantum jumps [12,13], this new generation of near quantumlimited amplifiers have opened up new experimental possibilities such as the creation and tomography of squeezed microwave light [14][15][16], and detailed weak measurement experiments [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Higher-Order Nonlinearities on Amplification and Squeezing in Josephson Parametric Amplifiers

et al. 2017

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Single-mode Josephson junction-based parametric amplifiers are often modeled as perfect amplifiers and squeezers. We show that, in practice, the gain, quantum efficiency, and output field squeezing of these devices are limited by usually neglected higher-order corrections to the idealized model. To arrive at this result, we derive the leading corrections to the lumped-element Josephson parametric amplifier of three common pumping schemes: monochromatic current pump, bichromatic current pump, and monochromatic flux pump. We show that the leading correction for the last two schemes is a single Kerr-type quartic term, while the first scheme contains additional cubic terms. In all cases, we find that the corrections are detrimental to squeezing. In addition, we show that the Kerr correction leads to a strongly phase-dependent reduction of the quantum efficiency of a phase-sensitive measurement. Finally, we quantify the departure from ideal Gaussian character of the filtered output field from numerical calculation of third and fourth order cumulants. Our results show that, while a Gaussian output field is expected for an ideal Josephson parametric amplifier, higher-order corrections lead to non-Gaussian effects which increase with both gain and nonlinearity strength. This theoretical study is complemented by experimental characterization of the output field of a flux-driven Josephson parametric amplifier. In addition to a measurement of the squeezing level of the filtered output field, the Husimi Q-function of the output field is imaged by the use of a deconvolution technique and compared to numerical results. This work establishes nonlinear corrections to the standard degenerate parametric amplifier model as an important contribution to Josephson parametric amplifier's squeezing and noise performance.

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“…These properties are utilized for various applications such as the development of the Fluxonion for quantum information precessing 5 , development of voltage standards in metrology 6 and for widely tunable parametric amplifiers 7 . Furthermore it is suggested that very long one-dimensional Josephson junction chains formed in a transmission line geometry can be employed for creating an analog of the event horizon and Hawking radiation 8,9 .…”

Section: Introductionmentioning

confidence: 99%

Phase sticking in one-dimensional Josephson junction chains

et al. 2013

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We studied current-voltage characteristics of long one dimensional Josephson junction chains with Josephson energy much larger than charging energy, EJ ≫ EC. In this regime, typical IV curves of the samples consist of a supercurrent branch at low bias voltages followed by a voltage-independent chain current branch, I Chain at high bias. Our experiments showed that I Chain is not only voltageindependent but it is also practically temperature-independent up to TC. We have successfully model the transport properties in these chains using a capacitively shunted junction model with nonlinear damping.

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Widely tunable parametric amplifier based on a superconducting quantum interference device array resonator

Cited by 370 publications

References 14 publications

Micromachined Integrated Quantum Circuit Containing a Superconducting Qubit

Micromachined Integrated Quantum Circuit Containing a Superconducting Qubit

Effect of Higher-Order Nonlinearities on Amplification and Squeezing in Josephson Parametric Amplifiers

Phase sticking in one-dimensional Josephson junction chains

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