Vibration isolation in a dilution refrigerator at ultra-low temperatures

Vibrations induced from a pulse tube cryocooler have been shown to degrade coherence time on qubits, limit resolution on cryogenic microscopy, and limit base temperature of dilution refrigerators. Traditionally, vibration is decoupled from ultra-low temperature cryogenics using thermally conducting foils, braids, or wires. These isolation techniques have been shown to be insufficient for sensitive measurements. A novel vibration isolation platform is developed and installed in a Maybell dilution refrigerator that suspends the lower three stages of the dilution refrigerator off three sets of leaf springs and polymer ropes. The vibration performance is measured and compared to ANSYS simulations.