Physics

A few good photons

Anonymous

Published Mar 2, 2011• 0 citations

Publisher

DOI: 10.1103/physics.4.s27

Related papers

Fermi-pressure-assisted superradiant transition with a mesoscopic Fermi gas in a cavity

Francesca Orsi, Ekaterina Fedotova, Rohit Prasad Bhatt +3 more

cond-mat.quant-gasCross-listedarXiv:2603.08691Mar 10, 20260 citations

A few good photons

Anonymous

Published Mar 2, 2011• 0 citations

Publisher

DOI: 10.1103/physics.4.s27

Related papers

Fermi-pressure-assisted superradiant transition with a mesoscopic Fermi gas in a cavity

Francesca Orsi, Ekaterina Fedotova, Rohit Prasad Bhatt +3 more

We study the superradiant phase transition of a mesoscopic Fermi gas comprising between a few tens and a few thousand $^6$ Li atoms in a high-finesse cavity across a wide range of densities. We observe a non-monotonic variation of the superradiant threshold as a function of density, with a minimum reached when the Fermi and recoil wavevectors are comparable. The minimum corresponds to a crossover between Fermi pressure-assisted ordering and Pauli blocking of photon scattering, in good agreement with theory. This interpretation is confirmed by a study of the atom-number dependence of the ordering threshold and photon number scaling. Our system opens the perspective of studying few-fermion systems with strong and coherent light-matter coupling.We study the superradiant phase transition of a mesoscopic Fermi gas comprising between a few tens and a few thousand $^6$Li atoms in a high-finesse cavity across a wide range of densities. We observe a non-monotonic variation of the superradiant threshold as a function of density, with a minimum reached when the Fermi and recoil wavevectors are comparable. The minimum corresponds to a crossover between Fermi pressure-assisted ordering and Pauli blocking of photon scattering, in good agreement with theory. This interpretation is confirmed by a study of the atom-number dependence of the ordering threshold and photon number scaling. Our system opens the perspective of studying few-fermion systems with strong and coherent light-matter coupling.

cond-mat.quant-gasCross-listedarXiv:2603.08691Mar 10, 20260 citations

More on photons

Sardar Singh

American Journal of PhysicsJan 1, 19841 citation

Dynamic Stark shift in a 3-level atomic system

Do-Young Jeong, K. S. Lee, A. S. Choe +2 more

AIP conference proceedingsJan 1, 19970 citations

More Photons

Yasushi Maeda

KobunshiJan 1, 20240 citations

Dissipative dynamics of few-photons superposition states: A dynamical invariant

Hong-Yan Wen, Jing Cheng, Yang, Y. +1 more

By numerically calculating the time-evolved Wigner functions, we investigate the dynamics of a few-photon superposed (e.g., up to two ones) state in a dissipating cavity. It is shown that, the negativity of the Wigner function of the photonic state unquestionably vanishes with the cavity's dissipation. As a consequence, the nonclassical effects related to the negativity of the Wigner function should be weakened gradually. However, it is found that the value of the second-order correlation function $g^{(2)}(0)$ (which serves usually as the standard criterion of a typical nonclassical effect, i.e., $g^{(2)}(0)<1$ implies that the photon is anti-bunching) is a dynamical invariant during the dissipative process of the cavity. This feature is also proven analytically and suggests that $g^{(2)}(0)$ might not be a good physical parameter to describe the photonic decays. Alternatively, we find that the anti-normal-order correlation function $g^{(2A)}(0)$ changes with the cavity's dissipation and thus is more suitable to describe the dissipative-dependent cavity. Finally, we propose an experimental approach to test the above arguments with a practically-existing cavity QED system.By numerically calculating the time-evolved Wigner functions, we investigate the dynamics of a few-photon superposed (e.g., up to two ones) state in a dissipating cavity. It is shown that, the negativity of the Wigner function of the photonic state unquestionably vanishes with the cavity's dissipation. As a consequence, the nonclassical effects related to the negativity of the Wigner function should be weakened gradually. However, it is found that the value of the second-order correlation function $g^{(2)}(0)$ (which serves usually as the standard criterion of a typical nonclassical effect, i.e., $g^{(2)}(0)<1$ implies that the photon is anti-bunching) is a dynamical invariant during the dissipative process of the cavity. This feature is also proven analytically and suggests that $g^{(2)}(0)$ might not be a good physical parameter to describe the photonic decays. Alternatively, we find that the anti-normal-order correlation function $g^{(2A)}(0)$ changes with the cavity's dissipation and thus is more suitable to describe the dissipative-dependent cavity. Finally, we propose an experimental approach to test the above arguments with a practically-existing cavity QED system.

arXiv:1110.3456Oct 16, 20110 citations

Photons on the rocks

Dirk Eidemüller

Optik & PhotonikJan 1, 20140 citations

We study the superradiant phase transition of a mesoscopic Fermi gas comprising between a few tens and a few thousand

^6

Li atoms in a high-finesse cavity across a wide range of densities. We observe a non-monotonic variation of the superradiant threshold as a function of density, with a minimum reached when the Fermi and recoil wavevectors are comparable. The minimum corresponds to a crossover between Fermi pressure-assisted ordering and Pauli blocking of photon scattering, in good agreement with theory. This interpretation is confirmed by a study of the atom-number dependence of the ordering threshold and photon number scaling. Our system opens the perspective of studying few-fermion systems with strong and coherent light-matter coupling.

g^{(2)}(0)

(which serves usually as the standard criterion of a typical nonclassical effect, i.e.,

g^{(2)}(0)<1

implies that the photon is anti-bunching) is a dynamical invariant during the dissipative process of the cavity. This feature is also proven analytically and suggests that

g^{(2)}(0)

might not be a good physical parameter to describe the photonic decays. Alternatively, we find that the anti-normal-order correlation function

g^{(2A)}(0)

changes with the cavity's dissipation and thus is more suitable to describe the dissipative-dependent cavity. Finally, we propose an experimental approach to test the above arguments with a practically-existing cavity QED system.