Entangled States in Interferometry |
| B. Hessmo, J. Söderholm and G. Björk Department of Microelectronics and Information Technology, Royal Institute of Technology, 16440 Kista, Sweden |
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| We show how some entangled quantum states can be used to improve interferometric measurements. We describe why Schrödinger-cat states are very sensitive to relative-phase shifts and why relative-phase states as described by A. Luis and L.L. Sanchez-Soto resolve the interval [0,2π] well. We also describe how the quantum concept of well-defined relative-phase and the classical visibility of an interference pattern are related. |
| DOI: 10.12693/APhysPolA.101.37 PACS numbers: 42.50.Dv |