Suppression of two-photon absorption by quantum interference

Yan, Min; Rickey, Edward G.; Zhu, Yanyan

doi:10.1103/physreva.64.043807

Cited by 114 publications

(63 citation statements)

References 15 publications

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“…[10,52,53,54,55,56,57,58] In particular, we can demonstrate that the four-level system of Fig. 7 can behave as either a low-energy quantum switch [58,59,60,61] or a quantum phase-shifter, [53] properties which can be harnessed for both classical and quantum information processing and distribution. [11,23,26,29,62,63] We assume that the magnitude of the Rabi frequency Ω c satisfies the inequality |Ω c | 2 ≪ γ 2 41 , so that we can define a complex third-order susceptibility for the |1 ←→ |2 transition by analogy with Eq.…”

Section: Tunable Transparency Of the Four-level N Atommentioning

confidence: 99%

“…9. We note that when ν c = 0, the presence of a photon at ω c (i.e., |Ω c | = 0) closes a "quantum switch" that causes the absorption of the probe photon, [59,60,61] and when ν c /γ 41 ≈ 30, the atom acts as a "quantum phase shifter" that is largely transparent but shifts the relative phase of the probe photon. [53] We explore the latter property of the four-level system in the next section, where we explicitly calculate the corresponding applied phase shift of a coherent superposition of single-photon states.…”

Section: Tunable Transparency Of the Four-level N Atommentioning

confidence: 99%

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Applications of coherent population transfer to quantum information processing

Munro¹,

Spiller²,

Beausoleil³

2004

Journal of Modern Optics

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We develop a theoretical framework for the exploration of quantum mechanical coherent population transfer phenomena, with the ultimate goal of constructing faithful models of devices for classical and quantum information processing applications. We begin by outlining a general formalism for weak-field quantum optics in the Schrödinger picture, and we include a general phenomenological representation of Lindblad decoherence mechanisms. We use this formalism to describe the interaction of a single stationary multilevel atom with one or more propagating classical or quantum laser fields, and we describe in detail several manifestations and applications of electromagnetically induced transparency. In addition to providing a clear description of the nonlinear optical characteristics of electromagnetically transparent systems that lead to "ultraslow light," we verify that -in principle -a multi-particle atomic or molecular system could be used as either a low power optical switch or a quantum phase shifter. However, we demonstrate that the presence of significant dephasing effects on the metastable levels destroys the induced transparency. Finally, a detailed calculation of the relative quantum phase induced by a system of atoms on a superposition of spatially distinct Fock states predicts that a significant quasi-Kerr nonlinearity and a low entropy cannot be simultaneously achieved in the presence of arbitrary spontaneous emission rates. Within our model, we identify the constraints that need to be met for this system to act as a one-qubit and a two-qubit conditional phase gate.

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Section: Tunable Transparency Of the Four-level N Atommentioning

confidence: 99%

Section: Tunable Transparency Of the Four-level N Atommentioning

confidence: 99%

Applications of coherent population transfer to quantum information processing

Munro¹,

Spiller²,

Beausoleil³

2004

Journal of Modern Optics

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“…We take EIT measurements to characterize the 2D MOT properties. EIT, 14 as a quantum interference between atomic transitions, has been widely used to manipulate optical response of an atomic medium, and found its wide applications in slow light, 39 nonlinear wave mixing, 18 optical switching, 16,17 entangled photon pair generation, [20][21][22] optical quantum memory, 51 and quantum information processing. 23 The EIT measurement scheme is shown in Fig.…”

Section: Magnetic Coil Designmentioning

confidence: 99%

“…12,13 The temperature of cold atoms in a MOT, typically ranging from tens to hundreds micron Kelvin (μK), in which the inhomogeneous Doppler broadening is negligible as compared to the atomic natural linewidth, is ideal for studying photon-atom interactions at quantum mechanics level without requiring further complicated sub-μK cooling techniques. Recently, many research efforts have been explored in using cold atoms in MOT to control and manipulate quantum interaction between photons and atoms, such as electromagnetically induced transparency (EIT), 14,15 low-light level nonlinear optics, [16][17][18] optical storage, 19 and entangled photon pair generation. [20][21][22] Motivated by the Duan, Lukin, Cirac, and Zoller (DLCZ) protocol, 23 MOTs with the EIT configuration may act as standard quantum repeaters and nodes in a long-distance quantum communication network.…”

Section: Introductionmentioning

confidence: 99%

A dark-line two-dimensional magneto-optical trap of 85Rb atoms with high optical depth

Zhang¹,

Chen²,

Liu³

et al. 2012

Review of Scientific Instruments

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We describe the apparatus of a dark-line two-dimensional (2D) magneto-optical trap (MOT) of 85Rb cold atoms with high optical depth (OD). Different from the conventional configuration, two (of three) pairs of trapping laser beams in our 2D MOT setup do not follow the symmetry axes of the quadrupole magnetic field: they are aligned with 45° angles to the longitudinal axis. Two orthogonal repumping laser beams have a dark-line volume in the longitudinal axis at their cross over. With a total trapping laser power of 40 mW and repumping laser power of 18 mW, we obtain an atomic OD up to 160 in an electromagnetically induced transparency (EIT) scheme, which corresponds to an atomic-density-length product NL = 2.05 × 1015 m−2. In a closed two-state system, the OD can become as large as more than 600. Our 2D MOT configuration allows full optical access of the atoms in its longitudinal direction without interfering with the trapping and repumping laser beams spatially. Moreover, the zero magnetic field along the longitudinal axis allows the cold atoms maintain a long ground-state coherence time without switching off the MOT magnetic field, which makes it possible to operate the MOT at a high repetition rate and a high duty cycle. Our 2D MOT is ideal for atomic-ensemble-based quantum optics applications, such as EIT, entangled photon pair generation, optical quantum memory, and quantum information processing.

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“…Experimental realization of such photon switching by quantum interference in a four-level atomic system was described by Yan etal. [30]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Controllable Kerr Nonlinearity via Incoherent Pump Fields in Semiconductor Quantum Wells

Hamedi¹,

Sahrai²,

Tajalli³

2013

Quant. Phys. Lett.

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Abstract:A theoretical investigation is carried out into the impact of incoherent pumping fields and quantum interference induced by incoherent pumping fields on the Kerr nonlinearity in a three-level asymmetric semiconductor quantum well system. It is found that Kerr nonlinearity is so sensitive to the rate of incoherent pumping fields, but insensitive to the quantum interference induced by incoherent pumping fields. In addition, it is demonstrated that an enhanced Kerr nonlinearity with reduced absorption can be achieved just via the strength of Fano-type interference and without applying any coherent laser field. The obtained results are very different from the conventional schemes which coherent coupling fields are used to control the Kerr nonlinearity. This advantages make our electronic medium much more practical than its atomic counterpart due to its flexible design and the controllable interference strength.

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Suppression of two-photon absorption by quantum interference

Cited by 114 publications

References 15 publications

Applications of coherent population transfer to quantum information processing

Applications of coherent population transfer to quantum information processing

A dark-line two-dimensional magneto-optical trap of 85Rb atoms with high optical depth

Controllable Kerr Nonlinearity via Incoherent Pump Fields in Semiconductor Quantum Wells

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