Strong couplings between artificial atoms and terahertz cavities

Zhang, M.; Jia, HY; Huang, Jianhua; Wei, L. F.

doi:10.1364/ol.35.001686

Cited by 8 publications

(4 citation statements)

References 15 publications

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“…The magnetic Purcell factors (PFs) predicted in this work are among the highest reported in the literature, potentially enabling the control of otherwise forbidden transitions. 47 We anticipate that our work will trigger a further quest for artificial atoms with transitions in the THz regime 48,49 or for ways to engineer TI NPs so as to push their optical response toward the visible region.…”

Section: Introductionmentioning

confidence: 99%

Dirac Plasmon Polaritons and Magnetic Modes in Topological-Insulator Nanoparticles

Kyvelos,

Yannopapas,

Mortensen

et al. 2024

ACS Photonics

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We demonstrate the existence of previously unreported magnetic modes with record-high magnetic Purcell factors (PFs) in topological-insulator nanospheres. Focusing on bismuth selenide (Bi 2 Se 3 ), and based on full electromagnetic Mie theory, we find magnetic modes arising from both displacement current loops in the bulk and surface currents due to delocalized surface states, induced by electronic transitions between topologically protected states within the Dirac cone and discretized due to the sphere finite size. Furthermore, we discuss how Dirac plasmon polaritons, resulting from the interaction between THz photons and Dirac electrons, dramatically influence both the magnetic and the electric transitions of quantum emitters placed near Bi 2 Se 3 nanospheres, significantly enhancing the corresponding PFs. These findings position Bi 2 Se 3 nanospheres, whose optical response is related to a richness of physical mechanisms, among the most promising candidates for enhancing light−matter interactions in nanophotonics and THz technologies.

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Section: Introductionmentioning

confidence: 99%

Dirac Plasmon Polaritons and Magnetic Modes in Topological-Insulator Nanoparticles

Kyvelos,

Yannopapas,

Mortensen

et al. 2024

ACS Photonics

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“…Remarkably, recent experiments [8][9][10] demonstrated the manipulations of electrons (confining, transporting, and detecting) on liquid Helium in the single-electron regime. This provides really the experimental platforms to realize the relevant QIP with electrons on liquid Helium [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Spin-orbit couplings between distant electrons trapped individually on liquid helium

Zhang

Wei

2012

Phys. Rev. B

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We propose an approach to entangle spins of electrons floating on the liquid Helium by coherently manipulating their spin-orbit interactions. The configuration consists of single electrons, confined individually on liquid Helium by the micro-electrodes, moving along the surface as the harmonic oscillators. It has been known that the spin of an electron could be coupled to its orbit (i.e., the vibrational motion) by properly applying a magnetic field. Based on this single electron spin-orbit coupling, here we show that a Jaynes-Cummings (JC) type interaction between the spin of an electron and the orbit of another electron at a distance could be realized via the strong Coulomb interaction between the electrons. Consequently, the proposed JC interaction could be utilized to realize a strong orbit-mediated spin-spin coupling and implement the desirable quantum information processing between the distant electrons trapped individually on liquid Helium.

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“…Such electrons are strongly-correlated [2][3][4][5] , very mobile, 6,7 and interact very weakly with the environment mostly through coupling to surface capillary waves (ripplons). Great interest in SSEs comes from several proposals to use electrons interacting with resonant microwave radiation for quantum computing as this system promises a scalable architecture for qubits with a very long coherence time [8][9][10][11][12][13][14] . In particular, these proposals stimulated recent studies of the inter-subband microwave absorption in SSEs [15][16][17] .…”

mentioning

confidence: 99%

First Study of Intersubband Absorption in Electrons on Helium under Quantizing Magnetic Fields

Konstantinov

Kono

2013

J. Phys. Soc. Jpn.

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We present the first measurements of inter-subband absorption of microwaves in surface electrons on liquid helium subjected to perpendicular magnetic field B. In quantizing B, the power absorption shows intermittent regions of enhanced and suppressed absorption. This behavior is caused by strong variation of the excited-electron decay rate with B. Particularly, fast decay due to elastic scattering provides condition for strong absorption and overheating of the electron system, while slow decay due to inelastic scattering limits absorption and causes its saturation. An unexpected feature is the strong suppression of absorption at magnetic fields where the inter-subband energy splitting is a multiple number of the cyclotron energy. PACS numbers: 67.90.+z, 73.20.At, 78.70.Gq Surface state electrons (SSEs) on liquid helium provide a unique example of a two-dimensional electron system 1 . Below 1 K, they are suspended in a vacuum about 10 nm above the liquid because of a strong repulsive barrier at the free surface. An attractive image potential is responsible for a subband structure with a discrete 1D energy spectrum ǫ n = R/n 2 , where n = 1, 2, .. and R = 7.6 (4.2) K for liquid 4 He ( 3 He). Such electrons are strongly-correlated 2-5 , very mobile, 6,7 and interact very weakly with the environment mostly through coupling to surface capillary waves (ripplons). Great interest in SSEs comes from several proposals to use electrons interacting with resonant microwave radiation for quantum computing as this system promises a scalable architecture for qubits with a very long coherence time [8][9][10][11][12][13][14] . In particular, these proposals stimulated recent studies of the inter-subband microwave absorption in SSEs 15-17 . Collin et al. found that temperature-dependent contribution to the absorption linewidth γ is small at low T and obtained a relatively large value of Ω R /γ ≈ 300 (Ω R is the Rabi frequency), which estimates the number of qubit operations per coherence time 15 . The Rabi frequency was estimated from the observed saturation of absorption assuming that electrons populate only the two lowest surface states. Later, it was shown that the excited-electron decay due to elastic scattering from the vapor atoms or ripplons provide an efficient channel to transfer the excitation energy into the kinetic energy of electron in-plane motion 17 . This causes strong overheating of the electron system, which results in population of higher excited states and absorption bleaching. The latter produces features similar to the absorption saturation in a two-level system but can be adequately described only taking into account the contribution from many energy levels 17 .The situation is different in a quantizing magnetic field B applied perpendicular to the surface, which confines the in-plane states of electrons to Landau levels E l =hω c (l − 1/2), l = 1, 2, .., where ω c = eB/m is the cyclotron frequency. Then, the fast decay of the microwave-excited electron due to elastic scattering can be suppressed providing...

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Strong couplings between artificial atoms and terahertz cavities

Cited by 8 publications

References 15 publications

Dirac Plasmon Polaritons and Magnetic Modes in Topological-Insulator Nanoparticles

Dirac Plasmon Polaritons and Magnetic Modes in Topological-Insulator Nanoparticles

Spin-orbit couplings between distant electrons trapped individually on liquid helium

First Study of Intersubband Absorption in Electrons on Helium under Quantizing Magnetic Fields

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