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The principles and design of 'active' self-propelling particles that can convert energy, move directionally on their own, and perform a certain function is an emerging multidisciplinary research field, with high potential for future technologies. A simple and effective technique is presented for on-demand steering of self-propelling microdiodes that move electroosmotically on water surface, while supplied with energy by an external alternating (AC) field. It is demonstrated how one can control remotely the direction of diode locomotion by electronically modifying the applied AC signal. The swimming diodes change their direction of motion when a wave asymmetry (equivalent to a DC offset) is introduced into the signal. The data analysis shows that the ability to control and reverse the direction of motion is a result of the electrostatic torque between the asymmetrically polarized diodes and the ionic charges redistributed in the vessel. This novel principle of electrical signal-coded steering of active functional devices, such as diodes and microcircuits, can find applications in motile sensors, MEMs, and microrobotics. [ABSTRACT FROM AUTHOR]

This paper is devoted to the theoretical analysis of Talbot effects in a curved square waveguide. A remote steering antenna as an important application of Talbot effects is considered. It is shown that the wavebeam repetition is considerably spoiled by the curvature even for bending angles about 5° if the steering plane coincides with the bending plane. However, high-efficient repetition exists at certain launching angles. If the wavebeam steering plane is perpendicular to the waveguide bending plane, high-efficient repetition takes place in a broad band of launching angles in the waveguide of the optimized rectangular cross-section. [ABSTRACT FROM AUTHOR]

An interesting protocol for classical teleportation of an unknown classical state was recently suggested by Cohen, and by Gour and Meyer. In that protocol, Bob can sample from a probability distribution $\mathcal{P}$ that is given to Alice, even if Alice has absolutely no knowledge about $\mathcal{P}$. Pursuing a similar line of thought, we suggest here a limited form of non-locality — "classical non-locality." Our non-locality is the (somewhat limited) classical analogue of the Hughston–Jozsa–Wootters (HJW) quantum non-locality. The HJW non-locality (also known as "quantum remote steering") tells us how, for a given density matrix ρ, Alice can generate any ρ-ensemble on the North Star. This is done using surprisingly few resources — one shared entangled state (prepared in advance), one generalized quantum measurement, and no communication. Similarly, our classical non-locality (which we call "classical remote steering") presents how, for a given probability distribution $\mathcal{P}$, Alice can generate any $\mathcal{P}$-ensemble on the North Star, using only one correlated state (prepared in advance), one (generalized) classical measurement, and no communication. It is important to clarify that while the classical teleportation and the classical non-locality protocols are probably rather insignificant from a classical information processing point of view, they significantly contribute to our understanding of what exactly is quantum in their well established and highly famous quantum analogues. [ABSTRACT FROM AUTHOR]