Spin-Nematic Squeezed Vacuum in a Quantum Gas
| Autor: | Corey Gerving, Thai M. Hoang, C. D. Hamley, Michael Chapman, E. M. Bookjans |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases Quantum Physics Scope (project management) Atomic Physics (physics.atom-ph) Quantum gas Quantum limit FOS: Physical sciences General Physics and Astronomy Physics - Atomic Physics Quantum Gases (cond-mat.quant-gas) Liquid crystal Quantum electrodynamics Quantum mechanics Condensed Matter::Strongly Correlated Electrons Quantum Physics (quant-ph) Condensed Matter - Quantum Gases Spin-½ Squeezed coherent state |
| Popis: | Using squeezed states it is possible to surpass the standard quantum limit of measurement uncertainty by reducing the measurement uncertainty of one property at the expense of another complementary property. Squeezed states were first demonstrated in optical fields and later with ensembles of pseudo spin-1/2 atoms using non-linear atom-light interactions. Recently, collisional interactions in ultracold atomic gases have been used to generate a large degree of quadrature spin squeezing in two-component Bose condensates. For pseudo spin-1/2 systems, the complementary properties are the different components of the total spin vector , which fully characterize the state on an SU(2) Bloch sphere. Here, we measure squeezing in a spin-1 Bose condensate, an SU(3) system, which requires measurement of the rank-2 nematic or quadrupole tensor as well to fully characterize the state. Following a quench through a nematic to ferromagnetic quantum phase transition, squeezing is observed in the variance of the quadratures up to -8.3(-0.7 +0.6) dB (-10.3(-0.9 +0.7) dB corrected for detection noise) below the standard quantum limit. This spin-nematic squeezing is observed for negligible occupation of the squeezed modes and is analogous to optical two-mode vacuum squeezing. This work has potential applications to continuous variable quantum information and quantum-enhanced magnetometry. |
| Databáze: | OpenAIRE |
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