Circuit quantum electrodynamics architecture for gate-defined quantum dots in silicon

Mi, Xiao; Cady, Jeffrey V; Zajac, D. M.; Stehlik, J.; Edge, L. F.; Petta, J. R.

doi:10.1063/1.4974536

Cited by 98 publications

(105 citation statements)

References 34 publications

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“…This gives light-matter coupling ratios Q e−ph = 4 and C e−ph = 34. In the Si/SiGe two-dimensional structure used for this experiment, the dot charging energies are typically of the order of E c 7 meV 33 . In comparison, the GaAs/AlGaAs structure of Ref.…”

Section: Resultsmentioning

confidence: 99%

“…Many different types of nanoconductors have already been embedded in coplanar cavities, such as lateral quantum dots defined on a GaAs/AlGaAs heterostructures 51,52 or Si/SiGe heterostructures 33,53 , quasi-one dimensional conductors such as carbon nanotubes 54,55 , InAs nanowires [56][57][58] , or InSb nanowires 59 , but also graphene quantum dots 60 and atomic contacts 35 . Different types of metallic contacts can be used, such as normal metals, superconductors 37 and ferromagnets with collinear 8 or non-collinear magnetizations 34,61 .…”

Section: Fig 1: Example Of Mesoscopic Qed Device (A)mentioning

confidence: 99%

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Cavity QED with hybrid nanocircuits: from atomic-like physics to condensed matter phenomena

Cottet¹,

Dartiailh²,

Desjardins³

et al. 2017

J. Phys.: Condens. Matter

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Circuit QED techniques have been instrumental to manipulate and probe with exquisite sensitivity the quantum state of superconducting quantum bits coupled to microwave cavities. Recently, it has become possible to fabricate new devices where the superconducting quantum bits are replaced by hybrid mesoscopic circuits combining nanoconductors and metallic reservoirs. This mesoscopic QED provides a new experimental playground to study the light-matter interaction in electronic circuits. Here, we present the experimental state of the art of Mesoscopic QED and its theoretical description. A first class of experiments focuses on the artificial atom limit, where some quasiparticles are trapped in nanocircuit bound states. In this limit, the Circuit QED techniques can be used to manipulate and probe electronic degrees of freedom such as confined charges, spins, or Andreev pairs. A second class of experiments consists in using cavity photons to reveal the dynamics of electron tunneling between a nanoconductor and fermionic reservoirs. For instance, the Kondo effect, the charge relaxation caused by grounded metallic contacts, and the photo-emission caused by voltage-biased reservoirs have been studied. The tunnel coupling between nanoconductors and fermionic reservoirs also enable one to obtain split Cooper pairs, or Majorana bound states. Cavity photons represent a qualitatively new tool to study these exotic condensed matter states.

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Section: Resultsmentioning

confidence: 99%

Section: Fig 1: Example Of Mesoscopic Qed Device (A)mentioning

confidence: 99%

Cavity QED with hybrid nanocircuits: from atomic-like physics to condensed matter phenomena

Cottet¹,

Dartiailh²,

Desjardins³

et al. 2017

J. Phys.: Condens. Matter

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“…The microwave cavity is often realized as a superconducting coplanar waveguide resonator 9,10,14,24,87 , with an example shown in the top left panel of FIG. 3a. In order to maximize the quality factor of the cavity and the chance of reaching the strong-coupling regime, each gate line leading to the DQD is sometimes filtered by an on-chip low pass LC-filter to suppress photon leakage from the cavity 86 . 34 , AAAS).…”

Section: Experimental Demonstrations Of Charge-photon Coupling With Qmentioning

confidence: 99%

Superconductor–semiconductor hybrid-circuit quantum electrodynamics

et al. 2020

Self Cite

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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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“…Deviations from universality arise in non-Fermi liquid regimes [40][41][42][43], or for the low-temperature limit of an Anderson impurity, upon breaking the Kondo singlet by an applied magnetic field [44][45][46]. An effective RC circuit also plays a central role in the photon-charge interaction in novel quantum hybrid circuits [47][48][49][50][51][52] and in energy transfer [53,54].…”

Section: Deg Cavitymentioning

confidence: 99%

Interacting mesoscopic capacitor out of equilibrium

2017

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We consider the full nonequilibrium response of a mesoscopic capacitor in the large transparency limit, exactly solving a model with electron-electron interactions appropriate for a cavity in the quantum Hall regime. For a cavity coupled to the electron reservoir via an ideal point contact, we show that the response to any time-dependent gate voltage V g (t) is strictly linear in V g . We analyze the charge and current response to a sudden gate voltage shift and find that this response is not captured by a simple circuit analogy. In particular, in the limit of strong interactions a sudden change in the gate voltage leads to the emission of a sequence of multiple charge pulses, the width and separation of which are controlled by the charge-relaxation time τ c = hC g /e 2 and the time of flight τ f . We also consider the effect of a finite reflection amplitude in the point contact, which leads to nonlinear-in-gate-voltage corrections to the charge and current response.

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Circuit quantum electrodynamics architecture for gate-defined quantum dots in silicon

Cited by 98 publications

References 34 publications

Cavity QED with hybrid nanocircuits: from atomic-like physics to condensed matter phenomena

Cavity QED with hybrid nanocircuits: from atomic-like physics to condensed matter phenomena

Superconductor–semiconductor hybrid-circuit quantum electrodynamics

Interacting mesoscopic capacitor out of equilibrium

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