Single artificial-atom lasing

Astafiev, O.; Inomata, K.; Niskanen, Antti; Yamamoto, Tsuyoshi; Pashkin, Yu. A.; Nakamura, Y.; Tsai, Jaw-Shen

doi:10.1038/nature06141

Cited by 323 publications

(426 citation statements)

References 18 publications

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“…The boundary of this interference pattern has a "V" shape that traces out the region where jϵ 0 j ∼ eV ac . Inside this region the ac drive sweeps the level detuning through ϵ ¼ 0 and the gain displays an interference pattern [7]. Outside this region the transmission through the cavity is decoupled from the DQD dynamics and G ¼ 1.…”

Section: Cavity Gainmentioning

confidence: 99%

“…Qubits separated by relatively large distances have been coherently coupled using a cavity bus [4,5]. Finally, cQED enables the generation of classical and nonclassical light [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Here, the source-drain bias continually repumps the excited state of the artificial atom, leading to population inversion and microwave frequency photoemission. For sufficiently high pumping rates, a transition to above-threshold masing has been achieved [7,8].…”

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: 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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“…This unique possibility to experimentally explore the foundations of quantum physics has greatly evolved with the advent of circuit QED [4][5][6][7][8][9][10][11][12][13] , where on-chip superconducting qubits and oscillators play the roles of two-level atoms and cavities, respectively. In the strong coupling limit, atom and cavity can exchange a photon frequently before coherence is lost.…”

mentioning

confidence: 99%

Circuit quantum electrodynamics in the ultrastrong-coupling regime

et al. 2010

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In cavity quantum electrodynamics (QED) 1-3 , light-matter interaction is probed at its most fundamental level, where individual atoms are coupled to single photons stored in three-dimensional cavities. This unique possibility to experimentally explore the foundations of quantum physics has greatly evolved with the advent of circuit QED 4-13 , where on-chip superconducting qubits and oscillators play the roles of two-level atoms and cavities, respectively. In the strong coupling limit, atom and cavity can exchange a photon frequently before coherence is lost. This important regime has been reached both in cavity and circuit QED, but the design flexibility and engineering potential of the latter allowed for increasing the ratio between the atom-cavity coupling rate g and the cavity transition frequency ωr above the percent level 8,14,15 . While these experiments are well described by the renowned Jaynes-Cummings model 16 , novel physics is expected when g reaches a considerable fraction of ωr. Promising steps towards this so-called ultrastrong coupling regime 17,18 have recently been taken in semiconductor structures 19,20 . Here, we report on the first experimental realization of a superconducting circuit QED system in the ultrastrong coupling limit and present direct evidence for the breakdown of the Jaynes-Cummings model. We reach remarkable normalized coupling rates g/ωr of up to 12 % by enhancing the inductive coupling of a flux qubit 21 to a transmission line resonator using the nonlinear inductance of a Josephson junction 22 . Our circuit extends the toolbox of quantum optics on a chip towards exciting explorations of the ultrastrong interaction between light and matter.In the strong coupling regime, the atom-cavity coupling rate g exceeds the dissipation rates κ and γ of both, cavity and atom, giving rise to coherent light-matter oscillations and superposition states. This regime was reached in various types of systems operating at different energy scales [1][2][3][23][24][25] . At microwave frequencies, strong coupling is feasible due to the enormous engineerability of superconducting circuit QED systems 4,5 . Here, small cavity mode volumes and large dipole moments of artificial atoms 26 enable coupling rates g of about 15 1 % of the cavity mode frequency ω r . Nevertheless, as in cavity QED, the quantum dynamics of these systems follows the Jaynes-Cummings model, which describes the coherent exchange of a single excitation between the atom and the cavity mode. Although the Hamiltonian of a realistic atom-cavity system contains so-called counterrotating terms allowing the simultaneous creation ior annihilation of an excitation in both atom and cavity mode, these terms can be safely neglected for small normalized coupling rates g/ω r . However, when g becomes a significant fraction of ω r , the counterrotating terms are expected to manifest, giving rise to exciting effects in QED.The ultrastrong coupling regime is difficult to reach in traditional quantum optics, but was recently realized in a solid-stat...

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“…In this section we show how a charge qubit can be used as an artificial atom for the generation of coherent CW microwave radiation [63]. Indeed, charge qubits, like other types of qubits, behave like atoms: they have discrete energy levels and transitions may take place between them.…”

Section: Single Artificial-atom Lasingmentioning

confidence: 99%

Josephson charge qubits: a brief review

Pashkin

Astafiev

Yamamoto

et al. 2009

Quantum Inf Process

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The field of solid-state quantum computation is expanding rapidly initiated by our original charge qubit demonstrations. Various types of solid-state qubits are being studied, and their coherent properties are improving. The goal of this review is to summarize achievements on Josephson charge qubits. We cover the results obtained in our joint group of NEC Nano Electronics Research Laboratories and RIKEN Advanced Science Institute, also referring to the works done by other groups. Starting from a short introduction, we describe the principle of the Josephson charge qubit, its manipulation and readout. We proceed with coupling of two charge qubits and implementation of a logic gate. We also discuss decoherence issues. Finally, we show how a charge qubit can be used as an artificial atom coupled to a resonator to demonstrate lasing action.

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Single artificial-atom lasing

Cited by 323 publications

References 18 publications

Double Quantum Dot Floquet Gain Medium

Double Quantum Dot Floquet Gain Medium

Circuit quantum electrodynamics in the ultrastrong-coupling regime

Josephson charge qubits: a brief review

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