Coupling Two Distant Double Quantum Dots with a Microwave Resonator

Deng, Guangwei; Wei, Da; Li, Shu Xiao; Johansson, J.; Kong, Weiqiang; Li, Hai-Ou; Cao, Gang; Xiao, Ming; Guo, Guo-Ping; Nori, Franco; Jiang, Hongda

doi:10.1021/acs.nanolett.5b02400

Cited by 81 publications

(66 citation statements)

References 42 publications

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“…Recent technological progress is enabling the development of a new type of experiments where nanocircuits based on carbon nanotubes, semiconducting nanowires, two-dimensional electron gases or graphene, are coupled to coplanar microwave cavities [9][10][11][12][13][14][15][16][17][18][19][20] . This paves the way for the development of "Mesoscopic QED", a denomination introduced in a pioneering theory work 21 .…”

Section: Introductionmentioning

confidence: 99%

Electron-photon coupling in mesoscopic quantum electrodynamics

2015

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Understanding the interaction between cavity photons and electronic nanocircuits is crucial for the development of Mesoscopic Quantum Electrodynamics (QED). One has to combine ingredients from atomic Cavity QED, like orbital degrees of freedom, with tunneling physics and strong cavity field inhomogeneities, specific to superconducting circuit QED. It is therefore necessary to introduce a formalism which bridges between these two domains. We develop a general method based on a photonic pseudo-potential to describe the electric coupling between electrons in a nanocircuit and cavity photons. In this picture, photons can induce simultaneously orbital energy shifts, tunneling, and local orbital transitions. We study in details the elementary example of a single quantum dot with a single normal metal reservoir, coupled to a cavity. Photon-induced tunneling terms lead to a non-universal relation between the cavity frequency pull and the damping pull. Our formalism can also be applied to multi quantum dot circuits, molecular circuits, quantum point contacts, metallic tunnel junctions, and superconducting nanostructures enclosing Andreev bound states or Majorana bound states, for instance.

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Section: Introductionmentioning

confidence: 99%

Electron-photon coupling in mesoscopic quantum electrodynamics

2015

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“…A key ingredient, the strong coupling of individual charges [15,16] or spins [17][18][19] to individual microwave photons, has recently been realized in semiconductor implementations of circuit quantum electrodynamics (QED) [20].Here, we present experiments in which the coherent photon-mediated coupling between two spatially separated semiconductor qubits is realized both in the resonant and the dispersive regime using high impedance SQUID array resonators. The high Josephson inductance of the SQUID array increases the strength of the vacuum fluctuations of the electric field, enhancing the coupling strength of the individual qubits to the resonator [16] and consequently the qubitqubit coupling, which allows us to overcome the limitations of prior experiments [17,21,22]. This key step holds the strong promise that two-qubit gates based on photon-mediated interactions, which are a corner-stone in quantum information processing with superconducting circuits [23], are implementable with semiconductor qubits based on a variety of material systems.…”

mentioning

confidence: 99%

Microwave Photon-Mediated Interactions between Semiconductor Qubits

et al. 2018

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The realization of a coherent interface between distant charge or spin qubits in semiconductor quantum dots is an open challenge for quantum information processing. Here we demonstrate both resonant and non-resonant photon-mediated coherent interactions between double quantum dot charge qubits separated by several tens of micrometers. We present clear spectroscopic evidence of the collective enhancement of the resonant coupling of two qubits. With both qubits detuned from the resonator we observe exchange coupling between the qubits mediated by virtual photons. In both instances pronounced bright and dark states governed by the symmetry of the qubit-field interaction are found. Our observations are in excellent quantitative agreement with masterequation simulations. The extracted two-qubit coupling strengths significantly exceed the linewidths of the combined resonator-qubit system. This indicates that this approach is viable for creating photon-mediated twoqubit gates in quantum dot based systems.Semiconductor nanostructure based systems are one of the promising contenders for quantum information processing since they offer flexibility in tuning, long coherence times and well-established fabrication techniques [1,2]. However, scaling to larger numbers of qubits remains a challenge, since many coupling mechanisms for realizing two-qubit gates are short range, i.e. limited to nearest neighbors. For scaling to larger systems and eventually to a full scale quantum computer, a combination of short and longer range interactions seems promising [3].So far, short range (∼ 100 nm) qubit-qubit interaction has been realized via capacitive or exchange coupling between charge [4-6] and spin qubits [7-10], which was expanded by making use of interactions mediated by additional qubits (∼ 400 nm) [11] or electronic cavities (∼ 1.7 µm) [12]. However, it is predicted that the range of interaction between semiconductor qubits can be increased significantly using microwave photons [3,13,14]. A key ingredient, the strong coupling of individual charges [15,16] or spins [17][18][19] to individual microwave photons, has recently been realized in semiconductor implementations of circuit quantum electrodynamics (QED) [20].Here, we present experiments in which the coherent photon-mediated coupling between two spatially separated semiconductor qubits is realized both in the resonant and the dispersive regime using high impedance SQUID array resonators. The high Josephson inductance of the SQUID array increases the strength of the vacuum fluctuations of the electric field, enhancing the coupling strength of the individual qubits to the resonator [16] and consequently the qubitqubit coupling, which allows us to overcome the limitations of prior experiments [17,21,22]. This key step holds the strong promise that two-qubit gates based on photon-mediated interactions, which are a corner-stone in quantum information processing with superconducting circuits [23], are implementable with semiconductor qubits based on a variety of material systems. ...

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“…The circuit has been introduced and characterized in Refs. [308,309]. The circuit-QED environment here couples to the left lead only, and by applying a gauge transformation we can reach a similar capacitive coupling as in Eq.…”

Section: Hybrid Systemsmentioning

confidence: 82%

Driven dissipative dynamics and topology of quantum impurity systems

Hur

Henriet

Herviou

et al. 2018

Comptes Rendus. Physique

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In this review, we provide an introduction and overview to some more recent advances in real-time dynamics of quantum impurity models and their realizations in quantum devices. We focus on the Ohmic spin-boson and related models, which describes a single spin-1/2 coupled to an infinite collection of harmonic oscillators. The topics are largely drawn from our efforts over the past years, but we also present a few novel results. In the first part of this review, we begin with a pedagogical introduction to the real-time dynamics of a dissipative spin at both high and low temperatures. We then focus on the driven dynamics in the quantum regime beyond the limit of weak spin-bath coupling. In these situations, the non-perturbative stochastic Schroedinger equation method is ideally suited to numerically obtain the spin dynamics as it can incorporate bias fields h z (t) of arbitrary time-dependence in the Hamiltonian. We present different recent applications of this method: (i) how topological properties of the spin such as the Berry curvature and the Chern number can be measured dynamically, and how dissipation affects the topology and the measurement protocol, (ii) how quantum spin chains can experience synchronization dynamics via coupling to a common bath. In the second part of this review, we discuss quantum engineering of spin-boson and related models in circuit quantum electrodynamics (cQED), quantum electrical circuits and cold-atoms architectures. In different realizations, the Ohmic environment can be represented by a long (microwave) transmission line, a Luttinger liquid, a one-dimensional Bose-Einstein condensate, a chain of superconducting Josephson junctions. We show that the quantum impurity can be used as a quantum sensor to detect properties of a bath at minimal coupling, and how dissipative spin dynamics can lead to new insight in the Mott-Superfluid transition.

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Coupling Two Distant Double Quantum Dots with a Microwave Resonator

Cited by 81 publications

References 42 publications

Electron-photon coupling in mesoscopic quantum electrodynamics

Electron-photon coupling in mesoscopic quantum electrodynamics

Microwave Photon-Mediated Interactions between Semiconductor Qubits

Driven dissipative dynamics and topology of quantum impurity systems

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