High efficiency coherent optical memory with warm rubidium vapour

Hosseini, Mahdi; Sparkes, B. M.; Campbell, Geoff; Lam, Ping Koy; Buchler, Benjamin

doi:10.1038/ncomms1175

Cited by 300 publications

(279 citation statements)

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“…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.…”

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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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Coherent Optical Memory with High Storage Efficiency and Large Fractional Delay

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“…According to the formula in Ref. [30], we have D ∼ 0.004 m 2 /s for Rubidium atoms in buffer gas [21,22].…”

Section: Experimental Considerationsmentioning

confidence: 96%

“…Typical system parameters are ω 0 = 2π × 377.107 46 THz, ω 0 − ω c = 2π × 6.8 GHz, = −2π × 1.5 GHz, c 2π × 20 MHz, g 2π × 4.5 Hz, t p = 1 μs, a 1.45 mm, 2L = 0.2 m, η −2π × 10 MHz/m, and N 0.5 × 10 18 m −3 [21,22,29]. The optical depth |β| 3.8 is sufficiently large.…”

Section: Experimental Considerationsmentioning

confidence: 99%

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Diffusion effects in gradient echo memory

et al. 2013

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We study the effects of diffusion on a -gradient echo memory, which is a coherent optical quantum memory, using thermal gases. The efficiency of this memory is high for short storage time, but decreases exponentially due to decoherence as the storage time is increased. We study the effects of both longitudinal and transverse diffusion in this memory system, and give both analytical and numerical results that are in good agreement. Our results show that diffusion has a significant effect on the efficiency. Further, we suggest ways to reduce these effects to improve storage efficiency. We also report on a mechanism by which the rate of expansion of the transverse width of the beam is reduced compared to the naive expectation of diffusive effects, as observed in recent experiments.

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“…Photon-echo revivals in molecular rotational coherences have been shown to enable efficient quantum control of molecular alignment [4], photochemical reactions [5], as well as synthesis of ultrashort field waveforms [6]. In the era of quantum information, photon echo is viewed as a promising strategy for quantum data storage and quantum memories [7,8,9,10] (recent reviews see also in [11,12,13,14]). …”

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All-optical photon echo on a chip

Moiseev¹,

Моисеев²

2016

Laser Phys. Lett.

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Abstract. We demonstrate that a photon echo can be implemented by alloptical means using an array of on-chip high-finesse ring cavities whose parameters are chirped in such a way as to support equidistant spectra of cavity modes. When launched into such a system, a classical or quantum optical signal -even a single-photon field -becomes distributed between individual cavities, giving rise to prominent coherence echo revivals at well-defined delay times, controlled by the chirp of cavity parameters. This effect enables long storage times for highthroughput broadband optical delay and quantum memory. All-optical photon echo and memory on a chip 2 Abstract. We demonstrate that a photon echo can be implemented by all-optical means using an array of on-chip highfinesse ring cavities whose parameters are chirped in such a way as to support equidistant spectra of cavity modes. When launched into such a system, a classical or quantum optical signal -even a single-photon field -becomes distributed between individual cavities, giving rise to prominent coherence echo revivals at well-defined delay times, controlled by the chirp of cavity parameters. This effect enables long storage times for high-throughput broadband optical delay and quantum memory.A photon echo [1, 2] is a broad class of optical phenomena where a coherence induced in a quantum system by an optical field is emitted in a form of a well-resolved intense optical signal, similar to the spin echo in nuclear magnetic resonance. Over decades, photon echo has been in use as a powerful method of coherent spectroscopy, providing unique information on transient processes in gases, liquid, and solids [3]. Photon-echo revivals in molecular rotational coherences have been shown to enable efficient quantum control of molecular alignment [4], photochemical reactions [5], as well as synthesis of ultrashort field waveforms [6]. In the era of quantum information, photon echo is viewed as a promising strategy for quantum data storage and quantum memories [7,8,9, 10] (recent reviews see also in [11,12,13,14]).Here, we show that a photon echo can be implemented by purely optical means using an array of on-chip high-finesse ring cavities whose parameters are chirped in such a way as to support equidistant spectra of cavity modes. A classical or quantum optical signal launched into such a system becomes distributed between individual cavities, giving rise to prominent coherence echo revivals at well-defined delay times, controlled by the chirp of cavity parameters. This effect enables long storage times for high-throughput broadband optical delay and quantum memory.We consider an array of N single-mode highfinesse chirped cavities with an equidistant spectrum of modes with a mode spacing ∆ (Fig. 1). An optical field coupled into such an array remains distributed between the cavities until all the cavity modes can re-emit in phase, giving rise to an intense photon-echo signals at the output. With appropriate coupling between the nanofiber and the cavities, which is possible, e.g....

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High efficiency coherent optical memory with warm rubidium vapour

Cited by 300 publications

References 28 publications

Coherent Optical Memory with High Storage Efficiency and Large Fractional Delay

Coherent Optical Memory with High Storage Efficiency and Large Fractional Delay

Diffusion effects in gradient echo memory

All-optical photon echo on a chip

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