All-optical controlled phase gate in quantum dot molecules

An all-optical quantum gate in a semiconductor quantum dot.

We report coherent optical control of a biexciton (two electron-hole pairs), confined in a single quantum dot, that shows coherent oscillations similar to the excited-state Rabi flopping in an isolated atom. The pulse control of the biexciton dynamics, combined with previously demonstrated control of the single-exciton Rabi rotation, serves as the physical basis for a two-bit conditional quantu...

Quantum phase gate and controlled entanglement with polar molecules

Gate-controlled electromechanical backaction induced by a quantum dot

Semiconductor-based quantum structures integrated into mechanical resonators have emerged as a unique platform for generating entanglement between macroscopic phononic and mesocopic electronic degrees of freedom. A key challenge to realizing this is the ability to create and control the coupling between two vastly dissimilar systems. Here, such coupling is demonstrated in a hybrid device compos...

Quantum-dot all-optical logic in a structured vacuum

We demonstrate multiwavelength channel optical logic operations on the Bloch vector of a quantum two-level system in the structured electromagnetic vacuum of a bimodal photonic crystal waveguide. This arises through a bichromatic strong-coupling effect that enables unprecedented control over single quantum-dot (QD) excitation through two beams of ultrashort femtojoule pulses. The second driving...

Quantum Dot Gate InGaAs FETs

This paper describes using wide energy gap lattice-matched II-VI layers, such as ZnSeTeZnMgSeTe, serving as a high-k gate dielectric for n-channel enhancement mode InGaAs field effect transistors (FETs). The thrust is to reduce interface states at the channel-gate insulator boundary while providing sufficient barrier height to confine the carriers in the channel created by inversion. In additio...