Photon Emission from a Cavity-Coupled Double Quantum Dot

Liu, Y.-Y.; Petersson, K. D.; Stehlik, J.; Taylor, Jacob M.; Petta, J. R.

doi:10.1103/physrevlett.113.036801

Cited by 119 publications

(215 citation statements)

References 41 publications

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“…The operating regime of the device is distinct from previous work on voltage-biased Josephson junctions and semiconductor DQDs, where a relatively large current flow was required to achieve photoemission [11]. Instead, our device is operated in Coulomb blockade, such that the net current flow through the device is negligible.…”

Section: Introductionmentioning

confidence: 81%

“…The power gain is defined as G ¼ CP out =P in , where P out is the cavity output power and C is a normalization constant set such that G ¼ 1 with the device configured in Coulomb blockade [8,11]. In Fig.…”

Section: Cavity Gainmentioning

confidence: 99%

“…n-photon Fock states were generated by repeating this process many times [9]. A second approach utilizes a source-drain bias to drive a current through a Cooper pair box or a double quantum dot (DQD) [10,11]. Here, the source-drain bias continually repumps the excited state of the artificial atom, leading to population inversion and microwave frequency photoemission.…”

Section: Introductionmentioning

confidence: 99%

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Double Quantum Dot Floquet Gain Medium

et al. 2016

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Strongly driving a two-level quantum system with light leads to a ladder of Floquet states separated by the photon energy. Nanoscale quantum devices allow the interplay of confined electrons, phonons, and photons to be studied under strong driving conditions. Here, we show that a single electron in a periodically driven double quantum dot functions as a "Floquet gain medium," where population imbalances in the double quantum dot Floquet quasienergy levels lead to an intricate pattern of gain and loss features in the cavity response. We further measure a large intracavity photon number n c in the absence of a cavity drive field, due to equilibration in the Floquet picture. Our device operates in the absence of a dc current-one and the same electron is repeatedly driven to the excited state to generate population inversion. These results pave the way to future studies of nonclassical light and thermalization of driven quantum systems.

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Section: Introductionmentioning

confidence: 81%

Section: Cavity Gainmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Double Quantum Dot Floquet Gain Medium

et al. 2016

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“…A further modification could be realized by incorporating the quantum dot into a setup related to circuit quantum electrodynamics (cQED), 37,38 thus replacing the drive from the gate voltage with one generated by a microwave cavity. Even more, cQED setups would also allow for replacing the classical drive (i.e.…”

Section: Discussionmentioning

confidence: 99%

Lifting the Franck-Condon blockade in driven quantum dots

et al. 2016

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Electron-vibron coupling in quantum dots can lead to a strong suppression of the average current in the sequential tunneling regime. This effect is known as Franck-Condon blockade and can be traced back to an overlap integral between vibron states with different electron numbers which becomes exponentially small for large electron-vibron coupling strength. Here, we investigate the effect of a time-dependent drive on this phenomenon, in particular the effect of an oscillatory gate voltage acting on the electronic dot level. We employ two different approaches: perturbation theory based on nonequilibrium Keldysh Green's functions and a master equation in Born-Markov approximation. In both cases, we find that the drive can lift the blockade by exciting vibrons. As a consequence, the relative change in average current grows exponentially with the drive strength.

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“…Due to the ideally exponential tunability of the NIS cooling and input powers using an applied bias voltage, these tunnel junctions are attractive candidates for quantum refrigerators. Although single-charge tunnelling has previously been demonstrated to emit and absorb energy quanta [26][27][28][29] even in applications such as the quantum cascade laser 30 , and artificial-atom masers [31][32][33] , it has not been experimentally utilized to directly cool engineered quantum circuits. Even the recently demonstrated autonomous Maxwell's demon has only been used to refrigerate dissipative electron systems 34 .…”

mentioning

confidence: 99%

Quantum-circuit refrigerator

Möttönen¹,

Tan²,

Masuda³

et al. 2017

Physics Today

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Quantum technology promises revolutionizing applications in information processing, communications, sensing and modelling. However, efficient on-demand cooling of the functional quantum degrees of freedom remains challenging in many solid-state implementations, such as superconducting circuits. Here we demonstrate direct cooling of a superconducting resonator mode using voltage-controllable electron tunnelling in a nanoscale refrigerator. This result is revealed by a decreased electron temperature at a resonator-coupled probe resistor, even for an elevated electron temperature at the refrigerator. Our conclusions are verified by control experiments and by a good quantitative agreement between theory and experimental observations at various operation voltages and bath temperatures. In the future, we aim to remove spurious dissipation introduced by our refrigerator and to decrease the operational temperature. Such an ideal quantum-circuit refrigerator has potential applications in the initialization of quantum electric devices. In the superconducting quantum computer, for example, fast and accurate reset of the quantum memory is needed.

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Photon Emission from a Cavity-Coupled Double Quantum Dot

Cited by 119 publications

References 41 publications

Double Quantum Dot Floquet Gain Medium

Double Quantum Dot Floquet Gain Medium

Lifting the Franck-Condon blockade in driven quantum dots

Quantum-circuit refrigerator

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