Using a pair of rectangular coils in the MOT for the production of cold atom clouds with large optical density

Lin, Yen-Wei; Chou, Hung-Chih; Dwivedi, Prashant; Chen, Ying-Cheng; Yu, Ite A.

doi:10.1364/oe.16.003753

Cited by 61 publications

(38 citation statements)

References 33 publications

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“…We also demonstrated that the classical fidelity of the recall pulse is better than 90% as measured by a beat-note interferometer [27]. Our results suggest that EIT-based quantum memory can be used for practical quantum information applications.The experiment was carried out in a cigar-shaped cloud of cold 87 Rb atoms produced by a magneto-optical trap (MOT) [28]. Typically, we trapped 1.0 × 10 9 atoms with…”

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Coherent Optical Memory with High Storage Efficiency and Large Fractional Delay

et al. 2013

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A high-storage efficiency and long-lived quantum memory for photons is an essential component in long-distance quantum communication and optical quantum computation. Here, we report a 78% storage efficiency of light pulses in a cold atomic medium based on the effect of electromagnetically induced transparency (EIT). At 50% storage efficiency, we obtain a fractional delay of 74, which is the best up-to-date record. The classical fidelity of the recalled pulse is better than 90% and nearly independent of the storage time, as confirmed by the direct measurement of phase evolution of the output light pulse with a beat-note interferometer. Such excellent phase coherence between the stored and recalled light pulses suggests that the current result may be readily applied to single photon wave packets. Our work significantly advances the technology of EIT-based optical memory and may find practical applications in long-distance quantum communication and optical quantum computation.PACS numbers: 42.50. Gy, 32.80.Qk Quantum memory [1][2][3][4][5][6][7][8] is essential for quantum information processing, including quantum communication [9][10][11] and quantum computation [12]. Using quantum repeaters will be a practical protocol for implementing long-distance quantum communication without suffering from transmission loss [13][14][15]. The scheme proposed in Ref.[13] divides a long distance into shorter elementary channels, stores and retrieves entanglement pairs, and extends the transmission distance via entanglement swapping. Quantum memory, a storage device mapping quantum state between light and matter, is a crucial component of the quantum repeater. Processing a particular task or waiting for the completion of others requires a quantum state to be stored in memory for a long enough time. Therefore, quantum memory with high storage efficiency (SE), which is defined as the ratio of recalled to input photon energies, and long coherence time are the keys to successful operation of long-distance quantum communication and quantum information processing.The fractional delay (FD) or delay-bandwidth product at 50% SE is a possible figure of merit for a memory in the no-cloning limit [16,17] or in the one-way quantum computation [18], where FD is defined as the ratio of storage time to the full-width-half-maximum (FWHM) pulse duration. Several memory devices based on different mechanisms, such as gradient photon echo, Raman interaction, and electromagnetically induced transparency (EIT), have been proposed and experimentally demonstrated. With the gradient echo memory, a maximum SE of 87% as well as the FD of 11 at 50% SE for classical light was demonstrated [6], and the recall fidelity can be as high as 98% for coherent pulses containing around one photon [7]. With a far-off-resonant Raman transition, Ref. [8] showed Raman memory with an SE of 43% and a coherence time of approximately 1 µs for 300-ps coherent light pulses.Slowing and storing light using the EIT effect [19,20] has been intensively explored in the past two dec...

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“…The experiment was carried out in a cigar-shaped cloud of cold 87 Rb atoms produced by a magneto-optical trap (MOT) [28]. Typically, we trapped 1.0 × 10 9 atoms with |m=1¡ |m=2…”

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confidence: 99%

Coherent Optical Memory with High Storage Efficiency and Large Fractional Delay

et al. 2013

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“…Since the first demonstrations in 2001 [13,14], EIT storage has been studied in both hot atomic vapor cells [15][16][17] and cold atoms [18][19][20][21]. However, the reported experimental demonstration always has a very low storage efficiency that prevents it from practical applications.…”

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Optical storage with electromagnetically induced transparency in a dense cold atomic ensemble

et al. 2011

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“…The atom cloud had a cigarlike shape with a size of about 10×2.5×2.5 mm 3 . Details of our MOT setup and the production of the cigar-shaped atom cloud have been discussed elsewhere [10]. Figure 2 shows the experimental setup and the transition diagrams.…”

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Stationary Light Pulses in Cold Atomic Media and without Bragg Gratings

et al. 2009

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The underlying mechanism of the stationary light pulse (SLP) was identified as a band gap being created by a Bragg grating formed by two counter-propagating coupling fields of similar wavelength. Here we present a more general view of the formation of SLPs, namely several balanced four-wave mixing processes sharing the same ground-state coherence. Utilizing this new concept we report the first experimental observation of a bichromatic SLP at wavelengths for which no Bragg grating can be established. We also demonstrate the production of a SLP directly from a propagating light pulse without prior storage. Being easily controlled externally makes SLPs a very versatile tool for low-light-level nonlinear optics and quantum information manipulation.

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Using a pair of rectangular coils in the MOT for the production of cold atom clouds with large optical density

Cited by 61 publications

References 33 publications

Coherent Optical Memory with High Storage Efficiency and Large Fractional Delay

Coherent Optical Memory with High Storage Efficiency and Large Fractional Delay

Optical storage with electromagnetically induced transparency in a dense cold atomic ensemble

Stationary Light Pulses in Cold Atomic Media and without Bragg Gratings

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