Microwave Emission from Hybridized States in a Semiconductor Charge Qubit

Stockklauser, Anna; Maisi, Ville F.; Basset, Julien; Cujia, K. S.; Reichl, Christian; Wegscheider, Werner; Ihn, Thomas; Wallraff, Andreas; Ensslin, Klaus

doi:10.1103/physrevlett.115.046802

Cited by 68 publications

(94 citation statements)

References 38 publications

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“…Few examples of hybrid quantum systems include cavity-Quantum Electrodynamics (c-QED) arrays [2,[5][6][7], cold atoms coupled to light [8][9][10], optomechanical devices [11,12] and cavity-coupled quantum dots [2,[13][14][15][16][17][18][19][20][21]. The motivation for this paper is a class of recent experiments where quantum dots have been integrated with superconducting resonators, accomplishing sufficiently strong charge-cavity coupling of g ∼ 50 − 200 MHz [13,[22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Tunable photonic cavity coupled to a voltage-biased double quantum dot system: Diagrammatic nonequilibrium Green's function approach

et al. 2016

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We investigate gain in microwave photonic cavities coupled to voltage-biased double quantum dot systems with an arbitrary strong dot-lead coupling and with a Holstein-like light-matter interaction, by adapting the diagrammatic Keldysh nonequilibrium Green's function approach. We compute out-of-equilibrium properties of the cavity: its transmission, phase response, mean photon number, power spectrum, and spectral function. We show that by the careful engineering of these hybrid light-matter systems, one can achieve a significant amplification of the optical signal with the voltage-biased electronic system serving as a gain medium. We also study the steady state current across the device, identifying elastic and inelastic tunnelling processes which involve the cavity mode. Our results show how recent advances in quantum electronics can be exploited to build hybrid light-matter systems that behave as microwave amplifiers and photon source devices. The diagrammatic Keldysh approach is primarily discussed for a cavity-coupled double quantum dot architecture, but it is generalizable to other hybrid light-matter systems.

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Section: Introductionmentioning

confidence: 99%

Tunable photonic cavity coupled to a voltage-biased double quantum dot system: Diagrammatic nonequilibrium Green's function approach

et al. 2016

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“…Recent experiments confirmed that JPAs [5] and a Josephson traveling-wave parametric amplifier [6] can work near the quantum limit and can be used for a wide range of applications. These include generation of squeezed microwave fields [5,[7][8][9], measurement of a displacement of a nanomechanical oscillator [10,11], implementation of the high-fidelity single-shot measurement [12][13][14][15], quantum feedback [16,17], and feed-forward [18] for superconducting qubits, generation of the two-mode squeezed states of microwave photons [19] as well as read-out of double quantum dots [20,21].…”

Section: Introductionmentioning

confidence: 99%

Higher-order nonlinear effects in a Josephson parametric amplifier

Kochetov

Fedorov

2015

Phys. Rev. B

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Nonlinearity of the current-phase relationship of a Josephson junction is the key resource for a Josephson parametric amplifier (JPA) as well as for a Josephson traveling-wave parametric amplifier, the only devices in which the quantum limit for added noise has so far been approached at microwave frequencies. A standard approach to describe JPA takes into account only the lowest order (cubic) nonlinearity resulting in a Duffing-like oscillator equation of motion or in a Kerr-type nonlinearity term in the Hamiltonian. In this paper we derive the quantum expression for the gain of JPA including all orders of the Josephson junction nonlinearity in the linear response regime. We then analyze gain saturation effect for stronger signals within a semiclassical approach. Our results reveal nonlinear effects of higher orders and their implications for operation of a JPA.

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“…5 we illustrate the dependence of the lasing peaks on the tunneling strength t. Such a dependence was also checked in the experiments with single-level double quantum dots by Stockklauser et al 24 . They found that with stronger tunneling strength the hybridization of the levels leads to a merging of the resonance peaks.…”

Section: B Dependence On Further Parametersmentioning

confidence: 72%

“…Also double quantum dot (DQD) systems coupled to a microwave oscillator have been investigated already, both in theory [14][15][16][17][18][19] as well as in experiments [20][21][22][23][24][25][26] . By appropriately tuning the level structure of the DQD system with a single level each, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Lasing and transport in a multilevel double quantum dot system coupled to a microwave oscillator

2016

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We study a system of two quantum dots, each with several discrete levels, which are coherently coupled to a microwave oscillator. They are attached to electronic leads and coupled to a phonon bath, both leading to inelastic processes. For a simpler system with a single level in each dot it has been shown that a population inversion can be created by electron tunneling, which in a resonance situation leads to lasing-type properties of the oscillator. In the multi-level system several resonance situations may arise, some of them relying on a sequence of tunneling processes which also involve non-resonant, inelastic transitions. The resulting photon number in the oscillator and the currentvoltage characteristic are highly sensitive to these properties and accordingly can serve as a probe for microscopic details.

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Microwave Emission from Hybridized States in a Semiconductor Charge Qubit

Cited by 68 publications

References 38 publications

Tunable photonic cavity coupled to a voltage-biased double quantum dot system: Diagrammatic nonequilibrium Green's function approach

Tunable photonic cavity coupled to a voltage-biased double quantum dot system: Diagrammatic nonequilibrium Green's function approach

Higher-order nonlinear effects in a Josephson parametric amplifier

Lasing and transport in a multilevel double quantum dot system coupled to a microwave oscillator

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