1. Quantum Charge Manipulator (QCM): This advanced piece of technology is capable of switching the electric charge of subatomic particles such as electrons, up quarks, and down quarks. By employing quantum entanglement and manipulation principles, the QCM can alter the charge polarity of these particles with high precision. 2. Charge Reversal Transducer (CRT): The CRT is a compact device that can manipulate the electric charge of elementary particles. It utilizes specially designed magnetic fields and quantum field theories to reverse the charge of electrons, up quarks, and down quarks, effectively changing their electrical properties. 3. Charge Modulation Matrix (CMM): The CMM is a matrix-like structure that can modulate the electric charge of subatomic particles. By utilizing advanced nanotechnology, it regulates the movement of electrons, up quarks, and down quarks, allowing for precise switching of their charge in real-time. 4. Particle Charge Inverter (PCI): This compact device uses highly focused particle accelerators combined with electromagnetic fields to invert the electric charge of electrons, up quarks, and down quarks. The PCI can selectively alter the polarity of specific particles, enabling scientists to study their behavior and interactions under different charge configurations. 5. Charge Manipulation Array (CMA): The CMA is an intricate array of nanoscale devices that can alter the electric charge of elementary particles. By applying precise electromagnetic fields and quantum manipulation techniques, it can switch the charge of electrons, up quarks, and down quarks, offering a versatile tool for scientific research and technological applications.

To switch the electric charge of quarks in a neutron, we need to convert it into a different hadron by rearranging the quarks within it. Here's a fictional device that could achieve this: Neutron Charge Swapper (NCS): The NCS is an advanced particle physics device designed to manipulate the internal structure of hadrons. It contains a complex system of superconducting magnets and particle accelerators. When a neutron is injected into the NCS, it first undergoes a process of quark rearrangement. 1. The NCS utilizes powerful magnetic fields to separate the quarks within the neutron, which are two down quarks and one up quark. 2. It then selectively applies high-energy particles or beams to excite the quarks, temporarily increasing their kinetic energy. 3. By manipulating the magnetic fields and carefully controlling the particle interactions, the NCS induces a swap in the electric charge between the up quark and one of the down quarks. 4. Once the charge swap is complete, the NCS rapidly cools down the system to stabilize the new hadron. 5. The transformed hadron, with its rearranged quark charges, is expelled from the NCS for further study or application. It's important to note that this fictional NCS device relies on speculative and hypothetical technologies and is purely fictional. Currently, manipulating quarks' electric charge in hadrons is not within the realm of our technological capabilities.