Spin dynamics in InAs nanowire quantum dots coupled to a transmission line

Abstract

We study theoretically electron spins in nanowire quantum dots placed inside a transmission line resonator. Because of the spin-orbit interaction, the spins couple to the electric component of the resonator electromagnetic field and enable coherent manipulation, storage, and read-out of quantum information in an all-electrical fashion. Coupling between distant quantum-dot spins, in one and the same or different nanowires, can be efficiently performed via the resonator mode either in real time or through virtual processes. For the latter case we derive an effective spin-entangling interaction and suggest means to turn it on and off. We consider both transverse and longitudinal types of nanowire quantum-dots and compare their manipulation timescales against the spin relaxation times. For this, we evaluate the rates for spin relaxation induced by the nanowire vibrations (phonons) and show that, as a result of phonon confinement in the nanowire, this rate is a strongly varying function of the spin operation frequency and thus can be drastically reduced compared to lateral quantum dots in GaAs. Our scheme is a step forward to the formation of hybrid structures where qubits of different nature can be integrated in a single device.

Circuit quantum electrodynamics with a spin qubit

“…Trif et al have proposed using the cQED approach to couple two spin-orbit qubits via a cavity mediated interaction [22]. Based on our results, we can estimate the effective spin-cavity coupling strength using theory developed for single quantum [22].…”

“…Quantitative analysis of the cavity response requires a fully quantum mechanical model that accounts for photon exchange between the microwave field and the DQD [22,23]. In cavity QED, one considers interactions between an atom with transition frequency ω a = Ω/ and the photon field of the cavity, characterized by the resonance frequency ω 0 .…”

Microwave quantum optics and electron transport through a metallic dot strongly coupled to a transmission line cavity

“…semiconductor nanowires or carbon nanotubes, coupled to transmission lines, have received increasing attention. [8][9][10][11][12][13][14] A parallel development concerned the possibilities to perform fundamental quantum optics experiments with microwave photons in cavities. Experiments on microwave quantum optics range from arbitrary photon state preparation 15 and entanglement of cavity photons 16 to single photon generation, 17 microwave lasing 18 and fast tuning of cavity photon properties.…”

Maximal Rabi frequency of an electrically driven spin in a disordered magnetic field

“…(2) Nonlinear processes arising from the interaction of matter and electromagnetic fields are fundamentally important and have found a wide range of applications in nonlinear optics as well as in nanoelectronics. Subharmonic EDSR is a distinct example of such nonlinear processes, and might gain importance as a mechanism of nonlinear interaction between single-spin QDs and microwave nanocircuits [18,19]. (3) In a recent experiment using a CNT QD [7], the strong-driving regime of EDSR has been achieved: the authors estimated [20] a maximum electric-field amplitude of E ac ≈ 4 × 10 4 V/m, QD length L ≈ 100 nm, and level spacing ω 0 ≈ 3 meV, implying a ratio A/L ≈ 1.3 at maximum drive power.…”