Room-Temperature Single-photon level Memory for Polarization States

Kupchak, Connor; Mittiga, Thomas; Jordaan, Bertus; Namazi, Mehdi; Nölleke, Christian; Figueroa, Eden

doi:10.1038/srep07658

Cited by 37 publications

(33 citation statements)

References 31 publications

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“…That is to say, the memory stores just a single temporal mode, and a single temporal mode is retrieved from the memory [51]. This is clear from the structure of the solution (20), where the coherent mapping between input and output is described by the Green's function…”

Section: Mode Selectivitymentioning

confidence: 99%

“…An important class of memory protocol is based on stimulated twophoton transitions in a Λ-type atomic ensemble, where a bright control laser field couples the incident signal photons to a ground-state coherence in the atoms [17]. Memories based on electromagnetically-induced transparency (EIT) [18][19][20] and on far-off-resonant Raman absorption [21][22][23] both fall into this category, and in the following we will refer to all such memories as Λ-memories. Λ-memories in cold atoms have successfully stored single photons, but at room-temperature it was found that fluorescence noise [24] and four-wave mixing [25] became problematic.…”

Section: Introductionmentioning

confidence: 99%

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Theory of noise suppression inΛ-type quantum memories by means of a cavity

et al. 2017

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Quantum memories, capable of storing single photons or other quantum states of light, to be retrieved on-demand, offer a route to large-scale quantum information processing with light. A promising class of memories is based on far-off-resonant Raman absorption in ensembles of Λ-type atoms. However at room temperature these systems exhibit unwanted four-wave mixing, which is prohibitive for applications at the single-photon level. Here we show how this noise can be suppressed by placing the storage medium inside a moderate-finesse optical cavity, thereby removing the main roadblock hindering this approach to quantum memory.

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Section: Mode Selectivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theory of noise suppression inΛ-type quantum memories by means of a cavity

et al. 2017

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“…For this reason an alternate encoding is often used, such as the polarisation, orbital angular momentum, path, or arrival time (time-bin) of a single photon. Memories for polarisation qubits have been demonstrated using electromagnetically induced transparency (EIT) [11][12][13], atomic frequency comb (AFC) [14] memories, and Raman absorption [15]. EIT has also been used to store orbital angular momentum qubits with high fidelity [16].…”

mentioning

confidence: 99%

Dual-rail optical gradient echo memory

Higginbottom¹,

Geng²,

Campbell³

et al. 2015

Opt. Express

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We introduce a scheme for the parallel storage of frequency separated signals in an optical memory and demonstrate that this dual-rail storage is a suitable memory for high fidelity frequency qubits. The two signals are stored simultaneously in the Zeeman-split Raman absorption lines of a cold atom ensemble using gradient echo memory techniques. Analysis of the split-Zeeman storage shows that the memory can be configured to preserve the relative amplitude and phase of the frequency separated signals. In an experimental demonstration dual-frequency pulses are recalled with 35% efficiency, 82% interference fringe visibility, and 6 • phase stability. The fidelity of the frequency-qubit memory is limited by frequency-dependent polarisation rotation and ambient magnetic field fluctuations, our analysis describes how these can be addressed in an alternative configuration.

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“…To be suitable for quantum applications, it is important that the coherence properties of the light are preserved during the storage process [24]. In particular, it is necessary to preserve the mutual coherence between two subsequently stored and retrieved pulses, as well as the second order autocorrelation function of the retrieved signal [7].…”

mentioning

confidence: 99%

“…Ten millisecond coherence times have been demonstrated in suitable cells [20], and advances up to 100 s are possible with improved antirelaxation coating technology [21], clearly sufficient for most applications. A variety of memory protocols for alkali vapors have been developed [22], based either on absorption engineering [23], or optically controlled light-matter interaction [24][25][26]. While wavelength matching to QD photons has been achieved [17,18,27], a remaining challenge for building a QD compatible atomic memory is that the required acceptance bandwith of δf ¼ 0.5 − 1.0 GHz [28,29] is rather large compared to the intrinsic linewidth of the alkali D lines, which is on the order of δ Rb ¼ 5 MHz [30].…”

mentioning

confidence: 99%

Simple Atomic Quantum Memory Suitable for Semiconductor Quantum Dot Single Photons

et al. 2017

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Quantum memories matched to single photon sources will form an important cornerstone of future quantum network technology. We demonstrate such a memory in warm Rb vapor with on-demand storage and retrieval, based on electromagnetically induced transparency. With an acceptance bandwidth of δf ¼ 0.66 GHz, the memory is suitable for single photons emitted by semiconductor quantum dots. In this regime, vapor cell memories offer an excellent compromise between storage efficiency, storage time, noise level, and experimental complexity, and atomic collisions have negligible influence on the optical coherences. Operation of the memory is demonstrated using attenuated laser pulses on the single photon level. For a 50 ns storage time, we measure η 50 ns e2e ¼ 3.4ð3Þ% end-to-end efficiency of the fiber-coupled memory, with a total intrinsic efficiency η int ¼ 17ð3Þ%. Straightforward technological improvements can boost the end-to-end-efficiency to η e2e ≈ 35%; beyond that, increasing the optical depth and exploiting the Zeeman substructure of the atoms will allow such a memory to approach near unity efficiency. In the present memory, the unconditional read-out noise level of 9 × 10 −3 photons is dominated by atomic fluorescence, and for input pulses containing on average μ 1 ¼ 0.27ð4Þ photons, the signal to noise level would be unity. DOI: 10.1103/PhysRevLett.119.060502 Quantum networks built from optical fiber-linked quantum nodes [1] open manifold opportunities across a range of scientific and technological frontiers. For example, highspeed quantum cryptography networks can be used for unconditionally secure communication in metropolitan areas [2], and quantum networks can help realize large scale quantum computers and quantum simulators that will allow for exponential speed-up in solving complex problems [3,4]. Photonic quantum networks, in turn, require a scalable quantum node technology that allows for (i) storing quantum information in a quantum memory [5], and (ii) ondemand conversion of this information into single photons traveling along the network interconnects.To realize quantum nodes, a heterogeneous approach [6,7] is highly promising. Heterogeneous quantum nodes consist of a single photon source and a compatible quantum memory, where the systems may be completely different from each other and can be individually optimized. For the single photon source, self-assembled semiconductor quantum dots (QD) are arguably the best choice, as they allow for high speed on-demand photon generation with up to GHz emission rates and measured efficiencies [8-10] as high as 75%. These sources can emit indistinguishable single photons [9,11,12] or even polarization-entangled photon pairs [13,14], and the QD spin can be entangled with an emitted photon [15,16]. However, the quantum dot itself is not a good quantum memory, since the coherence times are limited by the comparably strong coupling to the solid-state environment. To make this exquisite source of single or entangled photons useful for quantum networks, the QD theref...

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Room-Temperature Single-photon level Memory for Polarization States

Cited by 37 publications

References 31 publications

Theory of noise suppression inΛ-type quantum memories by means of a cavity

Theory of noise suppression inΛ-type quantum memories by means of a cavity

Dual-rail optical gradient echo memory

Simple Atomic Quantum Memory Suitable for Semiconductor Quantum Dot Single Photons

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