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Quantum is the third studio album by instrumental rock/progressive metal supergroup Planet X, released in 2007 through Inside Out Music. Guitarist Allan Holdsworth was originally slated to feature on most tracks, but ended up not finishing the project. As a result, his solos remain only on "Desert Girl" and "The Thinking Stone".
François Couture at AllMusic gave Quantum four stars out of five, calling it "a quantum leap above previous Planet X releases" and "a surprisingly mature album". He praised the album's stronger compositions and better diversity over previous Planet X material, and listed "Alien Hip Hop", "Matrix Gate", "Space Foam", "Kingdom of Dreams" and "Desert Girl" as highlights.