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Universal Quantum Estimator

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arxiv quant-ph/0112073 v1 pith:SCBVP2IT submitted 2001-12-12 quant-ph

Universal Quantum Estimator

classification quant-ph
keywords quantumadvantagearbitraryarchitecturechannelscharacterizingcontrolled-swapdata
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present a simple device based on the controlled-SWAP gate that performs quantum state tomography. It can also be used to determine maximum and minimum eigenvalues, expectation values of arbitrary observables, purity estimation as well as characterizing quantum channels. The advantage of this scheme is that the architecture is fixed and the task performed is determined by the input data.

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