A measurement scheme for purity based on two two-body gates
arXiv:1201.2736 · doi:10.1103/PhysRevA.85.042316
Abstract
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.
7pages, 1figure
References in corpus (6)
- The Bloch Vector for N-Level Systems
- Direct estimations of linear and non-linear functionals of a quantum state
- Universal Quantum Estimator
- A device for feasible fidelity, purity, Hilbert-Schmidt distance and entanglement witness measurements
- Simple optical measurement of the overlap and fidelity of quantum states: An experiment
- Experimentally obtaining the Likeness of Two Unknown Quantum States on an NMR Quantum Information Processor
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