Quantum-Logic Gate between Two Optical Photons with an Average Efficiency above 40%

Quantum optical Fredkin gate.

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 Logic with Cavity Photons From Single Atoms.

We demonstrate quantum logic using narrow linewidth photons that are produced with an a priori nonprobabilistic scheme from a single ^{87}Rb atom strongly coupled to a high-finesse cavity. We use a controlled-not gate integrated into a photonic chip to entangle these photons, and we observe nonclassical correlations between photon detection events separated by periods exceeding the travel time ...

Hybrid Toffoli gate on photons and quantum spins

Quantum computation offers potential advantages in solving a number of interesting and difficult problems. Several controlled logic gates, the elemental building blocks of quantum computer, have been realized with various physical systems. A general technique was recently proposed that significantly reduces the realization complexity of multiple-control logic gates by harnessing multi-level inf...

Deterministic teleportation of a quantum gate between two logical qubits

A quantum computer has the potential to efficiently solve problems that are intractable for classical computers. Constructing a largescale quantum processor, however, is challenging due to errors and noise inherent in real-world quantum systems. One approach to this challenge is to utilize modularity—a pervasive strategy found throughout nature and engineering— to build complex systems robustly...