A bstract The double copy relates momentum-space scattering amplitudes in gauge and gravity theories. It has also been extended to classical solutions, where some cases an exact can be formulated directly terms of products fields position space. This is seemingly at odds with the origins copy, question why copies are possible space — when this form will break remained largely unanswered. In pap...

The classical double copy relates exact solutions of gauge, gravity, and other theories. Although widely studied, its origins domain applicability have remained mysterious. In this Letter, I show that a particular incarnation---the Weyl copy---can be derived using well-established ideas from twistor theory. As well as explaining where the comes from, formalism also shows it is more general than...

Quantum cryptography is known for enabling functionalities that are unattainable using classical information alone. Recently, Secure Software Leasing (SSL) has emerged as one of these areas interest. Given a target circuit $C$ from class, SSL produces an encoding enables recipient to evaluate $C$, and also the originator software verify been returned -- meaning relinquished possibility any furt...