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Distributed quantum computation requires that quantum operations may be acted on remote logical qubits. We investigate the possibility of the distributed quantum computation for nonlocal photons assisted by cavity quantum electrodynamics. We first give a compact circuit for the controlled-NOT gate on a remote two-photon system. For the Toffoli gate, we introduce two circuits for a bipartite system...
Quantum cascade devices have been shaped into compact, yet long spiral cavities to increase mid-infrared superluminescence power. A peak power of ∼57 mW at 250 K is obtained with a coherence length of ∼107 μm.
We report high power (>3 mW) mid-infrared superluminescent emission around 2100 cm−1 from Quantum Cascade devices. The superluminescent emission shows a Gaussian shape spectrum with FWHM of 80 cm−1.
Two separate contacts are incorporated into the different arms of Quantum Cascade lasers with asymmetric Mach-Zehnder interferometer type cavities. Preliminary results reveal an almost-continuous single mode tuning range of 20 cm−1 at 80K.
The idea of integrating an asymmetric Mach-Zehnder interferometer in Quantum Cascade laser cavities to introduce mode selectivity is proposed and analyzed. Preliminary results show narrowing of the laser spectra with such cavities.
Quantum Cascade lasers based on continuum-to-continuum design enable external cavity tuning over 340 cm−1 in pulsed mode operation at 15°C. Strong gain suppression over 320cm−1 is attributed to strong coupling between the laser transitions.
Single-mode Quantum Cascade lasers employing a candy-cane shaped Fabry-Perot cavity are demonstrated. Single-mode emission with ∼25 dB side mode suppression is achieved up to ∼500 mA above threshold current in pulsed operation.
Varying quantum cascade laser cavity length results in gain peak selection across a 118 cm-1 range; a result of a change in threshold voltage, and applied electric field as a function of cavity length.
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