A qubit circuit system comprising - a plurality of N groups of M qubit circuits, wherein N and M are a first and second integers greater than one; - a plurality of N RF transmission structures, each corresponding to a respective one of the groups of qubit circuits; - a plurality of N groups of M frequency selective filters, each group of frequency selective filters being coupled between a respective one of the N RF transmission structures and its corresponding group of qubit circuits, the M frequency selective filters in each group of frequency selective filters being configured for selectively passing RF signals at respective different pass frequencies to respective ones of the qubit circuits in the corresponding group; - a plurality of M time division multiplexing systems, each time division multiplexing system comprising an RF pulse generator and a controllable one-to-N multiplexer with an input coupled to an output of the RF pulse generator, the RF pulse generators of each of the time division multiplexing systems being operable to produce RF pulses containing undulations at a respective one of the pass frequencies of the M frequency selective filters in the groups of frequency selective filters; - a plurality of N RF combiners, each having M inputs coupled to outputs of the one-to-N multiplexers of each of the M time division multiplexing systems, each RF combiner having an output coupled to a respective one of the RF transmission structures; - a control circuit having first control outputs coupled to modulation inputs of the RF pulse generators and second control outputs coupled to control inputs of the controllable one-to-N multiplexers, the control circuit being configured to control successive transmission of simultaneous RF pulses from the RF pulse generators, and to control the controllable one-to-N multiplexers to pass individual ones of the RF pulses to selectable ones of the outputs of the one-to-N multiplexers in a multiplexing mode. - a plurality of N groups of M qubit circuits, wherein N and M are a first and second integers greater than one; - a plurality of N RF transmission structures, each corresponding to a respective one of the groups of qubit circuits; - a plurality of N groups of M frequency selective filters, each group of frequency selective filters being coupled between a respective one of the N RF transmission structures and its corresponding group of qubit circuits, the M frequency selective filters in each group of frequency selective filters being configured for selectively passing RF signals at respective different pass frequencies to respective ones of the qubit circuits in the corresponding group; - a plurality of M time division multiplexing systems, each time division multiplexing system comprising an RF pulse generator and a controllable one-to-N multiplexer with an input coupled to an output of the RF pulse generator, the RF pulse generators of each of the time division multiplexing systems being operable to produce RF pulses containing undulations at a respective one of the pass frequencies of the M frequency selective filters in the groups of frequency selective filters; - a plurality of N RF combiners, each having M inputs coupled to outputs of the one-to-N multiplexers of each of the M time division multiplexing systems, each RF combiner having an output coupled to a respective one of the RF transmission structures; - a control circuit having first control outputs coupled to modulation inputs of the RF pulse generators and second control outputs coupled to control inputs of the controllable one-to-N multiplexers, the control circuit being configured to control successive transmission of simultaneous RF pulses from the RF pulse generators, and to control the controllable one-to-N multiplexers to pass individual ones of the RF pulses to selectable ones of the outputs of the one-to-N multiplexers in a multiplexing mode.