Are there any good comprehensive review article on qubits? As in, one that gives a whole summary of all the possible platform and compare their strengths and weaknesses, like trapped ion, superconducting qubits, nuclear spin, quantum dots,etc.
However, what you are looking for (very laudably) is a comprehensive "nuts and bolts" text and that probably is yet to be written. Real and realistic (and decently stable) quantum cubits are too hard a proposition to solicit enthusiastic reviews, IMHO. But one never knows.
There is a short review describing principles of operation of quantum computers and their elements.
"Abstract: The radical advantage of quantum algorithms for processing information over the classical ones is discussed, quantum entanglement is considered as the basic resource of quantum computations, and the most promising and interesting proposals on realization of quantum computers on the basis of trapped ions, nuclear spins, quantum dots, superconducting structures, and others are described."