Saturation of a two-level atom in polychromatic fields

Ficek, Zbigniew; Seke, J.; Soldatov, A. V.; Adam, Gerhard

doi:10.1088/1464-4266/2/6/310

Cited by 15 publications

(15 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…An analytical approximation is obtained when considering only the subsystem of the coupled QDs without the cavity mode, we can then write µ and ν as function of only the atomic parameters ∆ 12 and Ω 12 . We find [52]:…”

Section: Dipole-dipole Coupled and Detuned Qds ∆12 = 0 And ω12 =mentioning

confidence: 95%

Tunable bandwidth and nonlinearities in an atom-photon interface with subradiant states

2018

View full text Add to dashboard Cite

Optical non-linearities at the single photon level are key features to build efficient photon-photon gates and to implement quantum networks. Such optical non-linearities can be obtained using an ideal two-level system such as a single atom coupled to an optical cavity. While efficient, such atom-photon interface however presents a fixed bandwidth, determined by the spontaneous emission time and thus the spectral width of the cavity-enhanced two-level transition, preventing an efficient transmission to bandwidth-mismatched atomic systems in a single quantum network. In the present work, we propose a tunable atom-photon interface making use of the direct dipole-dipole coupling of two slightly different atomic systems. We show that, when weakly coupled to a cavity mode and directly coupled through dipole-dipole interaction, the subradiant mode of two slightly-detuned atomic systems is optically addressable and presents a widely tunable bandwidth and single-photon nonlinearity.arXiv:1807.04105v1 [quant-ph]

show abstract

Section: Dipole-dipole Coupled and Detuned Qds ∆12 = 0 And ω12 =mentioning

confidence: 95%

Tunable bandwidth and nonlinearities in an atom-photon interface with subradiant states

2018

View full text Add to dashboard Cite

show abstract

“…Since the entanglement is usually measured by the concurrence, [37] we hope to rewrite the transmitted QFI as a function of the concurrence of the two entangled atoms when the Bell measurements are performed. For X states, the concurrence takes the form [38] C[ρ(t)] = 2max{0, K 1 (t), K 2 (t)}…”

Section: Relation Between the Transmitted Qfi And The Concurrence Of mentioning

confidence: 99%

Transmission of Quantum Fisher Information through Fluctuating Quantum Fields

Jin

2018

Annalen der Physik

View full text Add to dashboard Cite

Transmission of quantum Fisher information (QFI) of initially disentangled parties is studied and the results show that the indirect correlations generated by the environment, which is considered as a bath of fluctuating quantum fields, will help transmit the quantum information. Specifically, using N initially disentangled atoms-one in an excited state carried by one party (the sender, Alice) and the other in the ground state carried by the other parties (the receivers: Bob1, Bob2, . . . , Bob(N−1)), the phase factor of the state of another atom held by Alice can be transmitted from Alice to Bob with proper time. The transmitted QFI of the phase factor for each receiver has been calculated as a function of the transmitted distance as well as the measurement time and is found to be in relation with the concurrence of the pair of atoms that the sender and the receiver carry. For each transmitted distance, there exists an optimal measurement time to obtain the maximal transmitted QFI, which is in relation with the total number of receivers.

show abstract

“…By virtue of the present atom trapping and cooling techniques, it is possible to trap two atoms at distances of the order of a resonant wavelength [4 -6]. Based on these, theoretical generation of entanglement between atomic qubits has also been reported recently [7][8][9]. The results show that while the irreversible spontaneous decay of the atoms can lead to disentanglement of the initially entangled quantum states, by suitably controlling the interatomic separations it can also be used to create transient entanglement between two initially separable atoms [8,9].…”

Section: Introductionmentioning

confidence: 99%

Teleporting the one-qubit state via two-level atoms with spontaneous emission

Hu¹

2011

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

We study quantum teleportation via two two-level atoms coupled collectively to a multimode vacuum field and prepared initially in different atomic states. We concentrated on influence of the spontaneous emission, collective damping and dipole-dipole interaction of the atoms on fidelity dynamics of quantum teleportation and obtained the region of spatial distance between the two atoms over which the state can be teleported nonclassically. Moreover, we showed through concrete examples that entanglement of the channel state is the prerequisite but not the only essential quantity for predicting the teleportation fidelity.

show abstract

Saturation of a two-level atom in polychromatic fields

Cited by 15 publications

References 23 publications

Tunable bandwidth and nonlinearities in an atom-photon interface with subradiant states

Tunable bandwidth and nonlinearities in an atom-photon interface with subradiant states

Transmission of Quantum Fisher Information through Fluctuating Quantum Fields

Teleporting the one-qubit state via two-level atoms with spontaneous emission

Contact Info

Product

Resources

About