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Denkmayr T, Geppert H, Lemmel H, Waegell M, Dressel J, Hasegawa Y, Sponar S. Experimental Demonstration of Direct Path State Characterization by Strongly Measuring Weak Values in a Matter-Wave Interferometer. PHYSICAL REVIEW LETTERS 2017; 118:010402. [PMID: 28106455 DOI: 10.1103/physrevlett.118.010402] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Indexed: 06/06/2023]
Abstract
A method was recently proposed and experimentally realized for characterizing a quantum state by directly measuring its complex probability amplitudes in a particular basis using so-called weak values. Recently, Vallone and Dequal [Phys. Rev. Lett. 116, 040502 (2016)PRLTAO0031-900710.1103/PhysRevLett.116.040502] showed theoretically that weak measurements are not a necessary condition to determine the weak value. Here, we report a measurement scheme used in a matter-wave interferometric experiment in which the neutron path system's quantum state was characterized via direct measurements, using both strong and weak interactions. Experimental evidence is given that strong interactions outperform weak ones for tomographic accuracy. Our results are not limited to neutron interferometry, but can be used in a wide range of quantum systems.
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Affiliation(s)
| | | | - Hartmut Lemmel
- AtomInstitut, TU Wien, Stadionallee 2, 1020 Vienna, Austria
- Institut Laue-Langevin, 6, Rue Jules Horowitz, 38042 Grenoble Cedex 9, France
| | - Mordecai Waegell
- Institute for Quantum Studies, Chapman University, Orange, California 92866, USA
| | - Justin Dressel
- Institute for Quantum Studies, Chapman University, Orange, California 92866, USA
- Schmid College of Science and Technology, Chapman University, Orange, California 92866, USA
| | - Yuji Hasegawa
- AtomInstitut, TU Wien, Stadionallee 2, 1020 Vienna, Austria
| | - Stephan Sponar
- AtomInstitut, TU Wien, Stadionallee 2, 1020 Vienna, Austria
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