Magnetic shielding for quantum computers in cryogenic environments

Magnetic field shielding is crucial for the reliable operation of quantum computers. Traditionally, mu-metal is used for this purpose, but this material is not suitable for the extremely low temperatures in which quantum computers operate.

Magnetic Shields has therefore developed Cryophy: a special soft magnetic nickel-iron alloy that provides optimal magnetic shielding in cryogenic environments of 4 Kelvin (-269°C), where traditional mu-metal loses its effectiveness.

Magnetic properties (at 1 mm thickness):

• Saturation induction (G – T at 2 Oe ≈ 16 A/m): 8000 – 0.8
• Coercive force (Oe – A/m): 0.010 – 0.8
• Permeability (at 5 mOe ≈ 4 A/m): 70,000

Cryophy is available in various standard forms: plates, tubes or foil.
The dimensions range from 0.1 to 3.5 mm thickness, with widths from 10 to 640 mm and lengths from 500 to 3500 mm. This makes it possible to perfectly tailor Cryophy to the specific requirements of the applications.

Besides quantum computers, Cryophy can be applied in particle accelerators, in medical equipment such as MRI scanners, in research laboratories and in space travel for satellites or spacecraft.