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# Physics, amplifier, noiseless

In the JILA/NIST 'noiseless' amplifier a long line of superconducting magnetic sensors (beginning on the right in this colorized micrograph) made of sandwiches of two layers of superconducting niobium with aluminum oxide in between, creates a 'metamaterial' that selectively amplifies microwaves based on their amplitude rather than frequency or phase.

*PHY, *JILA, magnetic sensors, amplifiers, metamaterial, microwaves, amplitude

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October 14, 2008

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