Experimental Realization of Programmable Quantum Gate Array for Directly Probing Commutation Relations of Pauli Operators

Date: 2010-09-13
Authors X. -C. Yao, J. Fiurášek, H. Lu, W. -B. Gao, Y. -A Chen, Z. -B. Chen, and J. -W. Pan
Journal No. Phys. Rev. Lett. 105, 120402 (2010)
Abstract We experimentally demonstrate an advanced linear-optical programmable quantum processor that combines two elementary single-qubit programmable quantum gates. We show that this scheme enables direct experimental probing of quantum commutation relations for Pauli operators acting on polarization states of single photons. Depending on a state of two-qubit program register, we can probe either commutation or anticommutation relations. Very good agreement between theory and experiment is observed, indicating high-quality performance of the implemented quantum processor.