Phys. Rev. Lett. 60, 1218–1220 (1988)Study of the Aharonov-Anandan quantum phase by NMR interferometryReceived 19 November 1987; published in the issue dated 28 March 1988 Aharonov and Anandan have recently reformulated and generalized Berry’s phase by showing that a quantum system which evolves through a circuit C in projective Hilbert space acquires a geometrical phase β(C) related to the topology of the space and the geometry of the circuit. We present NMR interferometry experiments in a three-level system which demonstrate the Aharonov-Anandan phase and its topological invariance for different circuits. © 1988 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.60.1218
DOI:
10.1103/PhysRevLett.60.1218
PACS:
03.65.Bz, 42.10.Jd, 76.60.-k
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