Microwave Detection of Electron-Phonon Interactions in a Cavity-Coupled Double Quantum Dot

Hartke, Thomas; Liu, Y.-Y.; Gullans, Michael; Petta, J. R.

doi:10.1103/physrevlett.120.097701

Cited by 34 publications

(25 citation statements)

References 39 publications

(78 reference statements)

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“…This table gives our chosen parameters for numerical calculations. These values fall within the window of parameters in state-of-the-art experiments on DQD-cQED systems [72,77,78,102,103,105].…”

Section: Effective Hamiltonian and Emergent Pt Symmetrymentioning

confidence: 72%

“…It consists of two, identical coupled cavities, with a DQD in the left one. The cavity with the DQD is an existing experimental setup explored in a series of recent experiments [70][71][72][73]77,78,[102][103][104][105]. The parameters of the DQD are widely tunable in experiment and, under a voltage bias, the DQD can be population inverted, thereby making it a tunable gain medium for the cavity.…”

Section: Microscopic Hamiltonian For the Dqd Coupled To Circuit-qmentioning

confidence: 99%

“…whereB ph s is the phonon annihilation operator for the sth mode of the phononic bath, and λ ph s is its coupling to the DQD dipole operator. While this piece of the microscopic Hamiltonian is not necessary for the physics that we will discuss, it is unavoidable, and relevant, in some of the state-of-the-art experimental setups [70][71][72][73]102,103,105].…”

Section: Microscopic Hamiltonian For the Dqd Coupled To Circuit-qmentioning

confidence: 99%

“…The effect of the substrate phonons on the DQD, as well as the spectral function for the phonons, can vary depending on the platform. They have been well characterized in literature both theoretically [102,106,107] and experimentally [103,108]. The spectral function J ph (ω) in Eq.…”

Section: Microscopic Hamiltonian For the Dqd Coupled To Circuit-qmentioning

confidence: 99%

“…The setup we consider consists of a solidstate double quantum dot (DQD) connected to two coupled circuit-QED (cQED) cavities. In recent years, a DQD in a cQED cavity has been well characterized both theoretically and experimentally [75][76][77]89,92,93,[101][102][103]. It is known that when the DQD is voltage biased via electronic leads under suitable conditions, it can be population inverted and can act as a widely controllable gain medium [70,72,[93][94][95].…”

Section: Introductionmentioning

confidence: 99%

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Emergent PT symmetry in a double-quantum-dot circuit QED setup

Purkayastha

Kulkarni

Joglekar

2020

Phys. Rev. Research

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Open classical and quantum systems with effective parity-time (PT) symmetry, over the past five years, have shown tremendous promise for advances in lasers, sensing, and nonreciprocal devices. And yet, how such effective PT-symmetric non-Hermitian models emerge out of Hermitian quantum mechanics is not well understood. Here, starting from a fully Hermitian microscopic Hamiltonian description, we show that a non-Hermitian Hamiltonian emerges naturally in a double-quantum-dot (DQD) circuit-QED setup, which can be controllably tuned to the PT-symmetric point. This effective Hamiltonian governs the dynamics of two coupled circuit-QED cavities with a voltage-biased DQD in one of them. Our analysis also reveals the effect of quantum fluctuations on the PT-symmetric system. The PT transition is, then, observed both in the dynamics of cavity observables as well as via an input-output experiment. As a simple application of the PT transition in this setup, we show that loss-induced enhancement of amplification and lasing can be observed in the coupled cavities. By comparing our results with two conventional local Lindblad equations, we demonstrate the utility and limitations of the latter. Our results pave the way for an on-chip realization of a potentially scalable non-Hermitian system with a gain medium in the quantum regime, as well as its potential applications for quantum technology.

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Section: Effective Hamiltonian and Emergent Pt Symmetrymentioning

confidence: 72%

Section: Microscopic Hamiltonian For the Dqd Coupled To Circuit-qmentioning

confidence: 99%

Section: Microscopic Hamiltonian For the Dqd Coupled To Circuit-qmentioning

confidence: 99%

Section: Microscopic Hamiltonian For the Dqd Coupled To Circuit-qmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Emergent PT symmetry in a double-quantum-dot circuit QED setup

Purkayastha

Kulkarni

Joglekar

2020

Phys. Rev. Research

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Calibration‐Free and High‐Sensitivity Microwave Detectors Based on InAs/InP Nanowire Double Quantum Dots

Cornia

Demontis

Zannier

et al. 2023

Adv Funct Materials

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At the cutting‐edge of microwave detection technology, novel approaches which exploit the interaction between microwaves and quantum devices are rising. In this study, microwaves are efficiently detected exploiting the unique transport features of InAs/InP nanowire double quantum dot‐based devices, suitably configured to allow the precise and calibration‐free measurement of the local field. Prototypical nanoscale detectors are operated both at zero and finite source‐drain bias, addressing and rationalizing the microwave impact on the charge stability diagram. The detector performance is addressed by measuring its responsivity, quantum efficiency and noise equivalent power that, upon impedance matching optimization, are estimated to reach values up to ≈2000 A W−1, 0.04 and ≈10−16normalW/Hz${10^{ - 16}}{\rm{W}}/\sqrt {Hz} $, respectively. The interaction mechanism between the microwave field and the quantum confined energy levels of the double quantum dots is unveiled and it is shown that these semiconductor nanostructures allow the direct assessment of the local intensity of the microwave field without the need for any calibration tool. Thus, the reported nanoscale devices based on III‐V nanowire heterostructures represent a novel class of calibration‐free and highly sensitive probes of microwave radiation, with nanometer‐scale spatial resolution, that may foster the development of novel high‐performance microwave circuitries.

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Engineering Photon Delocalization in a Rabi Dimer with a Dissipative Bath

et al. 2018

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A Rabi dimer is used to model a recently reported circuit quantum electrodynamics system composed of two coupled transmission-line resonators with each being coupled to one qubit. In this study, a phonon bath is adopted to mimic the multimode micromechanical resonators and is coupled to the qubits in the Rabi dimer. The dynamical behavior of the composite system is studied by the Dirac-Frenkel time-dependent variational principle combined with the multiple Davydov D 2 ansätze. Initially, all the photons are pumped into the left resonator, and the two qubits are in the down state coupled with the phonon vacuum. In the strong qubit-photon coupling regime, the photon dynamics can be engineered by tuning the qubit-bath coupling strength α and photon delocalization is achieved by increasing α. In the absence of dissipation, photons are localized in the initial resonator. Nevertheless, with moderate qubit-bath coupling, photons are delocalized with quasiequilibration of the photon population in two resonators at long times. In this case, high-frequency bath modes are activated by interacting with depolarized qubits. For strong dissipation, photon delocalization is achieved via frequent photon-hopping within two resonators and the qubits are suppressed in their initial down state.circuit QED architectures have been designed and fabricated as research platforms in quantum computation [2,[6][7][8][9][10][11][12] and quantum information. [13][14][15][16] Due to high flexibility and tunability, circuit QED devices offer the possibility to simulate light-matter interactions in quantum systems with an integrated circuit. [1,10,12,17,18] Experiments focus on engineering the coupling between a single resonator and a qubit for controllable single-resonator systems. [19][20][21] A key challenge is to carry out quantum simulations of strongly correlated photons of coupled-resonator systems by controlling the inter-resonator photon coupling and device-environment interactions. [22,23] It gives rise to an interesting phenomenon of photon self-trapping due to the competition between the qubit-photon coupling and the inter-resonator photon hopping, which has been realized in experiment using transmon qubits and two coupled transmission-line resonators. [24] Another QED system composed of two coupled nonlinear resonators has been fabricated for quantum amplification. [25] Described as a Bose-Hubbard dimer, this device can also be used for photon generation. [26][27][28][29][30] Recent theoretical studies model the tunnel-coupled resonators each containing a qubit as a Jaynes-Cumming (JC) dimer, which is the smallest possible coupled-resonator system. [3,4,24,31,32] The JC Hamiltonian describes a QED system with weak qubit-photon coupling, which omits the counterrotating-wave (CRW) interactions between the qubit and the photon mode. [33] Experimental progress has made it possible to achieve ultra-strong coupling, [1,[34][35][36][37] where the qubit-photon coupling strength is comparable to the resonator frequency. In this regime, the JC...

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Microwave Detection of Electron-Phonon Interactions in a Cavity-Coupled Double Quantum Dot

Cited by 34 publications

References 39 publications

Emergent PT symmetry in a double-quantum-dot circuit QED setup

Emergent PT symmetry in a double-quantum-dot circuit QED setup

Calibration‐Free and High‐Sensitivity Microwave Detectors Based on InAs/InP Nanowire Double Quantum Dots

Engineering Photon Delocalization in a Rabi Dimer with a Dissipative Bath

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