Quantum physics: Tailor-made quantum states.

The article discusses tailor-made quantum states. A prerequisite for creating a functional quantum computer depends upon the ability to produce superposed quantum states arbitrarily. Topics include a report by Hofheinz and colleagues published within the issue regarding tailor-made quantum states, using photons that they piled up in a resonator. Also presented is the use of superconducting (zero-resistance) macroscopic circuits in the synthesis of quantum states.