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Quantum interference of large organic molecules.

Gerlich S, Eibenberger S, Tomandl M, Nimmrichter S, Hornberger K, Fagan PJ, Tüxen J, Mayor M, Arndt M - Nat Commun (2011)

Bottom Line: First proposed by Louis de Broglie a century ago, it has since been confirmed with a variety of particles from electrons up to molecules.Here we demonstrate new high-contrast quantum experiments with large and massive tailor-made organic molecules in a near-field interferometer.We show that even complex systems, with more than 1,000 internal degrees of freedom, can be prepared in quantum states that are sufficiently well isolated from their environment to avoid decoherence and to show almost perfect coherence.

View Article: PubMed Central - PubMed

Affiliation: University of Vienna, Vienna Center for Quantum Science and Technology, VCQ, Faculty of Physics, Boltzmanngasse 5, Vienna 1090, Austria.

No MeSH data available.


Related in: MedlinePlus

Quantum interferograms of tailor-made large organic molecules.Quantum interference well beyond the classical expectations has been observed for all molecules in the set. In all panels, the black circles represent the experimental result, the blue line is a sinusoidal fit to the data and the shaded area indicates the detector dark rate. (a) The beam of perfluoroalkylated nanospheres, PFNS8, is characterized by a mean velocity of v=63 m s−1 with a full width ΔvFWHM=13 m s−1. The observed contrast of Vobs=49±6% is in good agreement with the expected quantum contrast of Vquant=51% and is clearly discernible from the classically expected visibility of Vclass<1%. The stated uncertainty is the standard deviation of the fit to the data. (b) For PFNS10, the signal was too weak to allow a precise velocity measurement and quantum calculation. The oven position for these particles, however, limits the molecular velocity to v<80 m s−1 and therefore allows us to define an upper bound to the classical visibility. (c) For TPPF84, we measure v=95 m s−1 with ΔvFWHM=34 m s−1. This results in Vobs=33±3% with Vquant=30% and Vclass<1%. (d) The signal for TPPF152 is equally low compared with that of PFNS10. For this compound we find Vobs=16±2%, Vquant=45% and Vclass=1%.
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f3: Quantum interferograms of tailor-made large organic molecules.Quantum interference well beyond the classical expectations has been observed for all molecules in the set. In all panels, the black circles represent the experimental result, the blue line is a sinusoidal fit to the data and the shaded area indicates the detector dark rate. (a) The beam of perfluoroalkylated nanospheres, PFNS8, is characterized by a mean velocity of v=63 m s−1 with a full width ΔvFWHM=13 m s−1. The observed contrast of Vobs=49±6% is in good agreement with the expected quantum contrast of Vquant=51% and is clearly discernible from the classically expected visibility of Vclass<1%. The stated uncertainty is the standard deviation of the fit to the data. (b) For PFNS10, the signal was too weak to allow a precise velocity measurement and quantum calculation. The oven position for these particles, however, limits the molecular velocity to v<80 m s−1 and therefore allows us to define an upper bound to the classical visibility. (c) For TPPF84, we measure v=95 m s−1 with ΔvFWHM=34 m s−1. This results in Vobs=33±3% with Vquant=30% and Vclass<1%. (d) The signal for TPPF152 is equally low compared with that of PFNS10. For this compound we find Vobs=16±2%, Vquant=45% and Vclass=1%.

Mentions: We recorded quantum interferograms for all molecules of Figure 1, as shown in Figure 3. In all cases the measured fringe visibility V, that is, the amplitude of the sinusoidal modulation normalized to the mean of the signal, exceeds the maximally expected classical moiré fringe contrast by a significant multiple of the experimental uncertainty. This is best shown for TPPF84 and PFNS8, which reached the highest observed interference contrast in our high-mass experiments so far, with individual scans up to Vobs=33% for TPPF84 (m=2,814 AMU) and Vobs=49% for PFNS8 at a mass of m=5,672 AMU. In addition, we have observed a maximum contrast of Vobs=17±4% for PFNS10 and Vobs=16±2% for TPPF152 (see Figure 3), in which our classical model predicts Vclass=1%. This supports our claim of true quantum interference for all these complex molecules.


Quantum interference of large organic molecules.

Gerlich S, Eibenberger S, Tomandl M, Nimmrichter S, Hornberger K, Fagan PJ, Tüxen J, Mayor M, Arndt M - Nat Commun (2011)

Quantum interferograms of tailor-made large organic molecules.Quantum interference well beyond the classical expectations has been observed for all molecules in the set. In all panels, the black circles represent the experimental result, the blue line is a sinusoidal fit to the data and the shaded area indicates the detector dark rate. (a) The beam of perfluoroalkylated nanospheres, PFNS8, is characterized by a mean velocity of v=63 m s−1 with a full width ΔvFWHM=13 m s−1. The observed contrast of Vobs=49±6% is in good agreement with the expected quantum contrast of Vquant=51% and is clearly discernible from the classically expected visibility of Vclass<1%. The stated uncertainty is the standard deviation of the fit to the data. (b) For PFNS10, the signal was too weak to allow a precise velocity measurement and quantum calculation. The oven position for these particles, however, limits the molecular velocity to v<80 m s−1 and therefore allows us to define an upper bound to the classical visibility. (c) For TPPF84, we measure v=95 m s−1 with ΔvFWHM=34 m s−1. This results in Vobs=33±3% with Vquant=30% and Vclass<1%. (d) The signal for TPPF152 is equally low compared with that of PFNS10. For this compound we find Vobs=16±2%, Vquant=45% and Vclass=1%.
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Related In: Results  -  Collection

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f3: Quantum interferograms of tailor-made large organic molecules.Quantum interference well beyond the classical expectations has been observed for all molecules in the set. In all panels, the black circles represent the experimental result, the blue line is a sinusoidal fit to the data and the shaded area indicates the detector dark rate. (a) The beam of perfluoroalkylated nanospheres, PFNS8, is characterized by a mean velocity of v=63 m s−1 with a full width ΔvFWHM=13 m s−1. The observed contrast of Vobs=49±6% is in good agreement with the expected quantum contrast of Vquant=51% and is clearly discernible from the classically expected visibility of Vclass<1%. The stated uncertainty is the standard deviation of the fit to the data. (b) For PFNS10, the signal was too weak to allow a precise velocity measurement and quantum calculation. The oven position for these particles, however, limits the molecular velocity to v<80 m s−1 and therefore allows us to define an upper bound to the classical visibility. (c) For TPPF84, we measure v=95 m s−1 with ΔvFWHM=34 m s−1. This results in Vobs=33±3% with Vquant=30% and Vclass<1%. (d) The signal for TPPF152 is equally low compared with that of PFNS10. For this compound we find Vobs=16±2%, Vquant=45% and Vclass=1%.
Mentions: We recorded quantum interferograms for all molecules of Figure 1, as shown in Figure 3. In all cases the measured fringe visibility V, that is, the amplitude of the sinusoidal modulation normalized to the mean of the signal, exceeds the maximally expected classical moiré fringe contrast by a significant multiple of the experimental uncertainty. This is best shown for TPPF84 and PFNS8, which reached the highest observed interference contrast in our high-mass experiments so far, with individual scans up to Vobs=33% for TPPF84 (m=2,814 AMU) and Vobs=49% for PFNS8 at a mass of m=5,672 AMU. In addition, we have observed a maximum contrast of Vobs=17±4% for PFNS10 and Vobs=16±2% for TPPF152 (see Figure 3), in which our classical model predicts Vclass=1%. This supports our claim of true quantum interference for all these complex molecules.

Bottom Line: First proposed by Louis de Broglie a century ago, it has since been confirmed with a variety of particles from electrons up to molecules.Here we demonstrate new high-contrast quantum experiments with large and massive tailor-made organic molecules in a near-field interferometer.We show that even complex systems, with more than 1,000 internal degrees of freedom, can be prepared in quantum states that are sufficiently well isolated from their environment to avoid decoherence and to show almost perfect coherence.

View Article: PubMed Central - PubMed

Affiliation: University of Vienna, Vienna Center for Quantum Science and Technology, VCQ, Faculty of Physics, Boltzmanngasse 5, Vienna 1090, Austria.

No MeSH data available.


Related in: MedlinePlus