Radio frequency charge sensing in InAs nanowire double quantum dots

Jung, Minkyung; Schroer, M. D.; Petersson, K. D.; Petta, J. R.

doi:10.1063/1.4729469

Cited by 46 publications

(39 citation statements)

References 26 publications

(61 reference statements)

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“…Read out can therefore proceed by detecting the capacitance difference between these states [69]. Based on experiments in InAs nanowires, dispersive parity read out should be possible with less than a millisecond of integration time using standard amplifiers [67], or much faster with nearly quantum-limited amplifiers [71].…”

Section: Read Out Methodsmentioning

confidence: 99%

Milestones Toward Majorana-Based Quantum Computing

et al. 2016

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We introduce a scheme for preparation, manipulation, and read out of Majorana zero modes in semiconducting wires with mesoscopic superconducting islands. Our approach synthesizes recent advances in materials growth with tools commonly used in quantum-dot experiments, including gate control of tunnel barriers and Coulomb effects, charge sensing, and charge pumping. We outline a sequence of milestones interpolating between zero-mode detection and quantum computing that includes (1) detection of fusion rules for non-Abelian anyons using either proximal charge sensors or pumped current, (2) validation of a prototype topological qubit, and (3) demonstration of non-Abelian statistics by braiding in a branched geometry. The first two milestones require only a single wire with two islands, and additionally enable sensitive measurements of the system's excitation gap, quasiparticle poisoning rates, residual Majorana zero-mode splittings, and topological-qubit coherence times. These pre-braiding experiments can be adapted to other manipulation and read out schemes as well.

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Section: Read Out Methodsmentioning

confidence: 99%

Milestones Toward Majorana-Based Quantum Computing

et al. 2016

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“…In the absence of a DQD, = 0 and we find unhindered transmission of microwaves through the cavity ( = 1). Charge dynamics within the DQD results in an effective microwave admittance that loads the superconducting cavity, changing the cavity amplitude and phase response [68][69][70][71][72] . The electric susceptibility is greatest (and thus A is the smallest) for a symmetric DQD ( = 0) because in this configuration the electron is most easily transferred from left to right and back.…”

Section: Charge-photon Interactionmentioning

confidence: 99%

Superconductor–semiconductor hybrid-circuit quantum electrodynamics

et al. 2020

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| Light-matter interactions at the single particle level have generally been explored in the context of atomic, molecular, and optical physics. Recent advances motivated by quantum information science have made it possible to explore coherent interactions between photons trapped in superconducting cavities and superconducting qubits. Spins in semiconductors can have exceptionally long spin coherence times and can be isolated in silicon, the workhorse material of the semiconductor microelectronic industry. Here, we review recent advances in hybrid "super-semi" quantum systems that coherently couple superconducting cavities to semiconductor quantum dots. We first present an overview of the underlying physics that governs the behavior of superconducting cavities, semiconductor quantum dots, and their modes of interaction. We then survey experimental progress in the field, focusing on recent demonstrations of cavity quantum electrodynamics in the strong coupling regime with a single charge and a single spin. Finally, we broadly discuss promising avenues of future research. Figure 5 | Strong spin-photon coupling. a | Top left panel: SEM image of a Si/SiGe DQD used to achieve spin-photon coupling. The orange dashed lines represent the locations of a pair of Co micromagnets fabricated on top of the DQD. Top right panel shows a cross-sectional view of the device. The application of an external magnetic field ext z B polarizes the micromagnets and creates an inhomogeneous magnetic field having a component M z B parallel to ext z B and a component M x B orthogonal to ext z B . M x B changes sign between the two dots, assuming a value of M ,L x B for the left dot and M ,R x B for the right dot. As a result, the quantization axis of an electron's spin (red arrows) is dependent on the electron's position. b | Energy level diagram of a single electron trapped in a DQD in the presence of an inhomogeneous magnetic field as a function of the DQD detuning energy ε. Here ↑ and ↓ denote the Zeeman-split spin-states of the electron, L (R) denotes the single-dot orbital state of the left (right) dot and -(+) denotes the molecular bonding (anti-bonding) state formed by the hybridization of the L and R states. c | Left panel: Cavity transmission amplitude A/A0 as a function of f and ext z B . Vacuum Rabi splitting with a frequency 2gs/2π = 11.0 MHz is observed at ext 92.2 z B = mT. Right panel: Increasing the detuning to ε = 40 µeV greatly reduces the vacuum Rabi splitting, allowing for electrical control of the spin-photon coupling rate. d | Strong spin-photon coupling using a high impedance NbTiN nanowire resonator. The cavity transmission coefficient |S21| is plotted as a function of f and ext z B . Inset: Scanning electron microscope image of a portion of the NbTiN nanowire resonator. Panels a, b and c are adapted from REF. 36 , Macmillan Publishers Limited. Panel d is adapted with permission from REF. 37 , AAAS.

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“…If the state can be mapped to an electrical impedance, this goal can be achieved using radio-frequency reflectometry of an electrical resonator incorporating the quantum device [1]. This technique permits rapid readout of charge sensors [2,3], spin qubits [4], and nanomechanical resonators [5], as well as complex impedance measurements of quantum-dot circuits [6][7][8][9][10][11]. For optimal sensitivity, which can approach the quantum limit [12], impedance matching between the device and the external circuitry is essential to maximize power transfer between them [13,14].…”

Section: Introductionmentioning

confidence: 99%

Sensitive Radio-Frequency Measurements of a Quantum Dot by Tuning to Perfect Impedance Matching

et al. 2016

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Electrical readout of spin qubits requires fast and sensitive measurements, which are hindered by poor impedance matching to the device. We demonstrate perfect impedance matching in a radio-frequency readout circuit, using voltage-tunable varactors to cancel out parasitic capacitances. An optimized capacitance sensitivity of 1.6 aF= ffiffiffiffiffiffi Hz p is achieved at a maximum source-drain bias of 170-μV rootmean-square and with a bandwidth of 18 MHz. Coulomb blockade in a quantum-dot is measured in both conductance and capacitance, and the two contributions are found to be proportional as expected from a quasistatic tunneling model. We benchmark our results against the requirements for single-shot qubit readout using quantum capacitance, a goal that has so far been elusive.

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Radio frequency charge sensing in InAs nanowire double quantum dots

Cited by 46 publications

References 26 publications

Milestones Toward Majorana-Based Quantum Computing

Milestones Toward Majorana-Based Quantum Computing

Superconductor–semiconductor hybrid-circuit quantum electrodynamics

Sensitive Radio-Frequency Measurements of a Quantum Dot by Tuning to Perfect Impedance Matching

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