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Nilsson, Mathias; Rippe, Lars; Kröll, Stefan; Klieber, Robert; Suter, Dieter

doi:10.1103/physrevb.71.149902

Cited by 53 publications

(78 citation statements)

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“…2. The ratio of these two transitions is known from previous work [41], thus the optical depth of the |1/2g → |1/2e transition is readily inferred from the measured absorption spectrum.…”

Section: Comb Structure Measurementmentioning

confidence: 99%

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Towards an efficient atomic frequency comb quantum memory

Amari

Walther

Sabooni

et al. 2010

Journal of Luminescence

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We present an efficient photon-echo experiment based on atomic frequency combs [Phys. Rev. A 79, 052329 (2009)]. Echoes containing an energy of up to 35% of that of the input pulse are observed in a Pr 3+ -doped Y 2 SiO 5 crystal. This material allows for the precise spectral holeburning needed to make a sharp and highly absorbing comb structure. We compare our results with a simple theoretical model with satisfactory agreement. Our results show that atomic frequency combs has the potential for high-efficiency storage of single photons as required in future long-distance communication based on quantum repeaters.

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“…2. The ratio of these two transitions is known from previous work [41], thus the optical depth of the |1/2g → |1/2e transition is readily inferred from the measured absorption spectrum.…”

Section: Comb Structure Measurementmentioning

confidence: 99%

“…In the absence of dephasing backward recall can reach 100% efficiency by cancelation of the re-absorption, as discussed in Refs. [13,31,15,32,18] …”

Section: Theory Of Afcmentioning

confidence: 99%

Towards an efficient atomic frequency comb quantum memory

Amari

Walther

Sabooni

et al. 2010

Journal of Luminescence

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show abstract

“…Taking into account the demonstrated high efficiency storage [28], one can expect a gain G (l) > 10. However, note that the maximum bandwidth for this transition is ∼10 MHz, due to limitations imposed by ground state hyperfine splitting on the preparation of the initial absorption line via optical pumping [49].…”

Section: Longitudinally Broadened Mediamentioning

confidence: 99%

“…The transitions in crystals and glasses are inhomogeoeusly broadened, with values ranging from 40 MHz [46] in crystals to hundreds of GHz in crystals or glasses [42,47]. The preparation of the initial, narrow absorption line therefore requires an initial preparation step via optical pumping [48][49][50][51]. In low symmetry hosts, the RE ion's quantum states acquire permanent electric dipole moments, which allows shifting their energy levels through the application of a dc electric field -the dc Stark shift (for a review on optical Stark spectroscopy of solids see [33]).…”

Section: Longitudinally Broadened Mediamentioning

confidence: 99%

Temporal compression of quantum-information-carrying photons using a photon-echo quantum memory approach

Моисеев

Tittel

2010

Phys. Rev. A

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We study quantum compression and decompression of light pulses that carry quantum information using a photon-echo quantum memory technique with controllable inhomogeneous broadening of an isolated atomic absorption line. We investigate media with differently broadened absorption profiles, transverse and longitudinal, finding that the recall efficiency can be as large as unity and that the quantum information encoded into the photonic qubits can remain unperturbed. Our results provide new insight into reversible light-atom interaction, and are interesting in view of future quantum communication networks, where pulse compression and decompression may play an important role to increase the qubit rate, or to map quantum information from photonic carriers with large optical bandwidth into atomic memories with smaller bandwidth.

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“…2 Previous theoretical works have dealt with the problem of transferring population reliably in spite of the finite width of the frequency channels [5] and the use of phase compensating pulses to eliminate the effects of unknown detuning dependent phases acquired during pulses [6]. In the laboratory qubit initialisation [7] and basic manipulations [8] have been demonstrated with good fidelity and it appears that a fully entangling gate will soon be within reach.…”

Section: Introductionmentioning

confidence: 99%

Effects of ground-state hyperfine shifts in quantum computing with rare-earth-metal ions in solids

Tordrup

Mølmer

2007

Phys. Rev. A

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We present an investigation of the effects of constant but random shifts of the ground hyperfine qubit states in the setting of quantum computing with ion doped crystals. Complex hyperbolic secant pulses can be used to transfer ions reliably to electronically excited states, and a perturbative approach is used to analyse the effect of ground state hyperfine shifts. This analysis shows that the errors due to the hyperfine shift are dynamically supressed during gate operation, a fact we attribute to the AC Stark shift. Furthermore we present an implementation of a controlled phase gate which is resilient to the effects of the hyperfine shift. Decoherence and decay effects are included in simulations in order to show that a demonstration of quantum gates is feasible over the relevant range of system parameters.

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Erratum: Hole-burning techniques for isolation and study of individual hyperfine transitions in inhomogeneously broadened solids demonstrated inPr3+:Y2SiO<

Cited by 53 publications

References 0 publications

Towards an efficient atomic frequency comb quantum memory

Towards an efficient atomic frequency comb quantum memory

Temporal compression of quantum-information-carrying photons using a photon-echo quantum memory approach

Effects of ground-state hyperfine shifts in quantum computing with rare-earth-metal ions in solids

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