SQUID-Based Multiplexing by Slope Switching and Binary-to-Hadamard Address Translation

We have demonstrated multiplexing and demultiplexing of seven test signals using the Hadamard basis set. The encoding utilizes the sign change of the superconducting quantum interference device gain when a Φ₀/2 flux shift occurs. The periodicity of the superconducting quantum interference device response allows recursive construction of in principle arbitrarily high-order Hadamard matrices out of binary addresses, and hence makes possible to access N channels by log₂N address lines.