Tunable superconducting nanoinductors

Annunziata, Anthony; Santavicca, Daniel F.; Frunzio, Luigi; Catelani, Gianluigi; Rooks, M. J.; Frydman, A.; Prober, D. E.

doi:10.1088/0957-4484/21/44/445202

Cited by 205 publications

(193 citation statements)

References 21 publications

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“…Unlike the geometric inductance L g that is associated with the magnetic field of the ring, the kinetic inductance L k ¼ m 0 l 2 l/wh (m 0 is the vacuum permeability and l the length of the loop) stems from the motion of the Cooper pairs. Kinetic inductance becomes nonlinear with respect to shielding current I s as the kinetic energy approaches the depairing energy of the Cooper pairs 16,23 . With sufficiently small I s , the nonlinearity assumes a form…”

Section: Resultsmentioning

confidence: 99%

Kinetic inductance magnetometer

et al. 2014

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Sensing ultra-low magnetic fields has various applications in the fields of science, medicine and industry. There is a growing need for a sensor that can be operated in ambient environments where magnetic shielding is limited or magnetic field manipulation is involved. To this end, here we demonstrate a new magnetometer with high sensitivity and wide dynamic range. The device is based on the current nonlinearity of superconducting material stemming from kinetic inductance. A further benefit of our approach is of extreme simplicity: the device is fabricated from a single layer of niobium nitride. Moreover, radio frequency multiplexing techniques can be applied, enabling the simultaneous readout of multiple sensors, for example, in biomagnetic measurements requiring data from large sensor arrays.

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Section: Resultsmentioning

confidence: 99%

Kinetic inductance magnetometer

et al. 2014

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“…The external detection electronics would then be similar to that proposed by Divochiy et al [13]. To determine the detection area we provide an example of relatively standard dimensions for NbN nanowire detectors [9,10,12,14,15,16]. The device shown in figure (2) has six pixels in each arm and 6 arms.…”

Section: A Three Layer Architecturementioning

confidence: 99%

“…The characteristics of nanowire detectors have been studied in depth elsewhere [9,10,11,12,14,15,16,17,19]. We will not repeat this fundamental work but will instead characterize the unique qualities of this device.…”

Section: Detector Characteristicsmentioning

confidence: 99%

“…This inductance behaves linearly with the length of the wire. In fact the kinetic inductance of a wire can be tuned significantly by altering the geometry of the nanowire [14]. Therefore if all other parameters remain the same the easiest way of reducing the detectors reset time is to reduce the length of the wire.…”

Section: Detector Characteristicsmentioning

confidence: 99%

“…This reduces the current density in the rest of the unconstricted wire which has the effect of reducing the quantum efficiency η [17,19]. Also the narrowing of the nanowire may also effect the kinetic inductance mentioned above and in [14]. The quality of the manufacture will therefore have a large effect on the quantum efficiency.…”

Section: Fabricationmentioning

confidence: 99%

See 2 more Smart Citations

A multilayer three-dimensional superconducting nanowire photon detector

Smith

2012

SPIE Proceedings

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Abstract. Here we propose a new design paradigm for a superconducting nanowire single photon detector that uses a multi-layer architecture that places the electric leads beneath the nanowires. This allows for a very large number of detector elements, which we will call pixels in analogy to a conventional CCD camera, to be placed in close proximity. This leads to significantly better photon number resolution than current single and multi-nanowire meanders, while maintaining similar detection areas. We discuss the reset time of the pixels and how the design can be modified to avoid the latching failure seen in extremely short superconducting nanowires. These advantages give a multi-layer superconducting number-resolving photon detector significant advantages over the current design paradigm of long superconducting nanowire meanders. Such advantages are desirable in a wide array of photonics applications.

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Increasing fan‐in and fan‐out of the quantum phase slip junction‐based logic gates

Omranpour

Hashemi

2022

Circuit Theory & Apps

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Fan‐in and fan‐out of the quantum phase slip junction (QPSJ)‐based two‐input AND and OR gates are increased for the first time. For increasing their fan‐in, critical voltage, normal and sub‐gap resistances, and kinetic inductance of their constituent QPSJs are changed, and only input and buffer QPSJs are added to the gate. The number of elements in the proposed three‐ and four‐input OR and three‐ and four‐input AND gates is 13, 16, 16, and 20, respectively, which are fewer than those in the serial connection method. For increasing the fan‐out to two, only the mentioned parameters of the constituent QPSJs are changed and no extra element is added to the gate circuits. Comparing with the existing method which adds extra Josephson Junctions and QPSJs to the gate output, the number of elements in the proposed method is that of the basic two‐input gates. For the increased fan‐in/fan‐out OR gates, the critical margins of the external parameters are 10% and 15% of the input voltage, and the critical junction margins are 30% and 26% respectively, while for the increased fan‐in/fan‐out AND gates, they are 9% and 12% of the bias voltage and 26% and 23% for the critical junction margins, respectively.

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Tunable superconducting nanoinductors

Cited by 205 publications

References 21 publications

Kinetic inductance magnetometer

Kinetic inductance magnetometer

A multilayer three-dimensional superconducting nanowire photon detector

Increasing fan‐in and fan‐out of the quantum phase slip junction‐based logic gates

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