Entangling Photons with Mismatched Colors

Effects of frequency correlation in linear optical entangling gates operated with independent photons

Bose-Einstein coalescence of independent photons at the surface of a beam splitter is the physical process that allows linear optical quantum gates to be built. When distinct parametric down-conversion events are used as an independent photon source, distinguishability arises form the energy correlation of each photon with its twin. We derive upper bound for the entanglement which can be genera...

Entangling different-color photons via time-resolved measurement and active feed forward.

Entangling independent photons is not only of fundamental interest but also of crucial importance for quantum-information science. Two-photon interference is a major method for entangling independent identical photons. If two photons are different in color, perfect two-photon coalescence can no longer happen, which makes the entangling of different-color photons difficult to realize. In this Le...

Conclusive Entangling Probe

A design is given for an optimized entangling probe attacking the BB84 (Bennett-Brassard 1984) protocol of quantum key distribution and yielding maximum information to the probe for a full range of induced error rates. Probe photon polarization states become optimally entangled with the signal states on their way between the legitimate transmitter and receiver. Although standard von-Neumann pro...

Entangling Ambient Information with Peripheral Interaction

Ambient information systems have been an active research area since the 1990s. However, most of these ambient systems let the user only passively consume information, and do not provide a way to interact with it. In this paper, we offer a view beyond just representing information. We propose to engage the user in a peripheral interaction with the ambient device. By keeping it peripheral, all ad...

Entangling Superconductivity and Antiferromagnetism