# Quantum Mechatronics
## 2 Quantum Technologies in Robotics Systems  
In the field of quantum technologies in robotics systems, a series of works have been produced. Here, we succinctly describe them. In Ref. [12], it is shown that collaborative robotic tasks of unmanned systems can be performed in a network, where the agents are entangled. For example, the leader robot generates two polarization entangled photons, sending one of the pair of photons to each of two follower robots and/or autonomous vehicles. The follower robots measure these photons in a locally chosen polarization direction. These measurements result in computable correlations between the measurements, for instance, perfect correlations when the two users choose the same basis state and no correlations when they choose orthogonal basis states. Note that in this case, the users can pick any arbitrary polarization basis state, and as long as they \"match\", correlations will be high. The resulting correlation characteristics cannot be described by classical probability theory with local realism, as they arise due to the quantum connection between the spatially-separated photons. Entanglement can subsequently be used for QKD or other quantum communications applications. The first experimental steps to realize this concept were described in Ref. [13]. Ref. [14] describes the use of quantum entanglement and cryptography for automation and control of dynamic systems, understood as systems where the rate of change of its state variables is sizable. Quantum entanglement is proposed to be realized by spontaneous parametric down-conversion of photons. Two \"entangled\" autonomous systems may exhibit correlated behavior without any classical communication between them because of the quantum entanglement phenomenon. In an automation scenario, the \"Bob Robot\" shares quantum correlations with the \"Alice Robot\", being that [PERSON] and [PERSON] are the two parties involved. Even though macroscopic systems cannot be entangled, they can still communicate with each other via entangled photons and therefore, share genuine quantum correlations, enabling many applications. Quantum cryptography allows, furthermore, for guaranteed security. These capabilities may be implemented in the control of autonomous mechanical systems where, for example, an \"Alice Autonomous System\" can control a \"Bob Autonomous System\" via sharing distributed quantum keys. In Ref. [15], the application of quantum teleportation to the control of classical dynamic systems and autonomy is proposed. Quantum teleportation is a genuine quantum phenomenon, and was first described in how to teleport an unknown quantum state via dual classical and Einstein-Podolsky-Rosen channels in Ref. [16]. In this paper, the possibility of applying this quantum technique to autonomous mobile classical platforms in order to enhance control and autonomy is proposed. Ref. [17] introduces a procedure for automating the photon quantum experiments for mobile robotic applications. In parametric down-conversion experiments with entangled photons distributed between robots and/or drones, motorized optics equipment may align the photon sources to the detectors on the mobile robots in an automated way. This automatic alignment process is among the key enabling technologies for integrating quantum capabilities for the control of mobile robotic systems. In this paper, the automated alignment is studied, while analyzing the uncertainties in the dynamics of the system that may potentially make the alignment task highly challenging. Figure 1 shows an image of two quantum robots, Alice Robot and Bob Robot, prepared for sharing entangled photons. This way, they may establish secure communication among them. This is similar to the research described in Refs. [12; 13; 14; 15; 17]. Arguably, there are going to be many issues when trying to translate experiments, such as teleportation, that were previously performed on a bench or in fiber to mobile robots.