Professor Yasunobu Nakamura and his colleagues at the Research Center for Advanced Science and Technology (RCAST) and Associate Professor Kazuki Koshino at Tokyo Medical and Dental University have developed a new technique to prevent qubits from having a short lifespan. In a quantum computer, control lines are coupled to the qubits in order to access them individually. For this reason, shortening of the lifetime of qubits has been considered inevitable. However, it has been found that the short lifetime of qubits can be prevented by strongly coupling a nonlinear filter to the control line. This is a quantum interference effect known as anti-super-radiation, and is expected to have applications in quantum computing. The paper was published in the online edition of Physical Review Applied on 27 January.