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A measurement scheme for purity based on two two-body gates

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arxiv 1201.2736 v3 pith:ZM2YLE7R submitted 2012-01-13 quant-ph

A measurement scheme for purity based on two two-body gates

Hiromichi Nakazato , Toru Tanaka , Kazuya Yuasa , Giuseppe Florio , Saverio Pascazio This is my paper
classification quant-ph
keywords systemgatespurityschemestatecertaincompletecoupled
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A scheme for measuring the purity of a quantum system with a finite number of levels is presented. The method makes use of two square root of SWAP gates and only hinges on measurements performed on a reference system, prepared in a certain pure state and coupled with the target system. Neither tomographic methods, with the complete reconstruction of the state, nor interferometric setups is needed.

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  1. Kinematic budget of quantum correlations

    quant-ph 2026-03 reject novelty 5.0

    Global and marginal purities alone are claimed to place any state in a two-dimensional kinematic diagram whose boundary crossings certify NPT entanglement, steering, Bell nonlocality, and bounds on magic.