A Reconfigurable Cryogenic Platform for the Classical Control of   Scalable Quantum Computers
  Recent advances in solid-state qubit technology are paving the way to fault-tolerant quantum computing systems. However, qubit technology is limited by qubit coherence time and by the complexity of coupling the quantum system with a classical electronic infrastructure.   We propose an infrastructure, enabling to read and control qubits, that is implemented on a field-programmable gate array (FPGA). The FPGA platform supports functionality required by several qubit technologies and can operate physically close to the qubits over a temperature range from 4K to 300K. Extensive characterization of the platform over this temperature range revealed all major components (such as LUTs, MMCM, PLL, BRAM, IDELAY2) operate correctly and the logic speed is very stable. The stability is finally concretized by operating an integrated ADC with relatively stable performance over temperature. 
Harald Homulle, Stefan Visser, Bishnu Patra, Giorgio Ferrari, Enrico   Prati, Fabio Sebastiano, Edoardo Charbon
physics.ins-det quant-ph