Echo‐Based Quantum Memory

Campbell, Geoff; Ferguson, Katherine; Sellars, Matthew; Buchler, Benjamin; Lam, Ping Koy

doi:10.1002/9783527805785.ch32

Cited by 3 publications

(3 citation statements)

References 86 publications

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“…There are also numerous protocols that realise a quantum memory beyond what we describe in this work. In the interest of brevity, we refer the reader to several introductions of how the ensemble read-write (capture and release) QM system is achieved in practice [27][28][29][30][31].…”

Section: Quantum Memory Operations a Storing Photonic States In An At...mentioning

confidence: 99%

“…The choice of optical storage protocol prior to mapping to the longer lived spin states will heavily influence the available write time for each voxel. While there are numerous optical quantum memory protocols, for example Electromagnetically Induced Transparency (EIT) [27,31], Gradient Echo Memory (GEM) [27,30], and Atomic Frequency Comb (AFC) techniques [27,40]. To maximise the exposure time of the memory it will be essential to overcome the inhomogeneities in the atoms' optical frequencies.…”

Section: Increasing the Photonic Storage Density: Conceptsmentioning

confidence: 99%

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Quantum memories and the double-slit experiment: implications for astronomical interferometry

Bland-Hawthorn,

Sellars,

Bartholomew

2021

Preprint

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Thomas Young's slit experiment lies at the heart of classical interference and quantum mechanics. Over the last fifty years, it has been shown that particles (e.g. photons, electrons, large molecules), even individual particles, generate an interference pattern at a distant screen after passage through a double slit, thereby demonstrating wave-particle duality. We revisit this famous experiment by replacing both slits with singlemode fibre inputs to two independent quantum memories that are capable of storing the incident electromagnetic field's amplitude and phase as a function of time. At a later time, the action is reversed: the quantum memories are read out in synchrony and the singlemode fibre outputs are allowed to interact consistent with the original observation. In contrast to any classical memory device, the write and read processes of a quantum memory are non-destructive and hence, preserve the photonic quantum states. In principle, with sufficiently long storage times and sufficiently high photonic storage capacity, quantum memories operating at widely separated telescopes can be brought together to achieve optical interferometry over arbitrarily long baselines.

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Section: Quantum Memory Operations a Storing Photonic States In An At...mentioning

confidence: 99%

Section: Increasing the Photonic Storage Density: Conceptsmentioning

confidence: 99%

Quantum memories and the double-slit experiment: implications for astronomical interferometry

Bland-Hawthorn,

Sellars,

Bartholomew

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…An efficiency of 87% was previously demonstrated with warm vapour and then cold thermal atoms [25,35]. Attractions of the GEM scheme, beyond high efficiency, have been the applications in information processing made possible by the bandwidth, frequency, and spatial manipulations allowed by the frequency gradient [36].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetically-induced transparency assists the Raman gradient echo memory at moderate detuning, dependent on gradient order

Everett,

Papneja,

Saha

et al. 2024

New J. Phys.

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Optical quantum memories are essential for quantum communications and photonic quantum technologies. Ensemble optical memories based on 3-level interactions are a popular basis for implementing these memories. All such memories, however, suffer from loss due to scattering. In off-resonant 3-level interactions, such as the Raman gradient echo memory (GEM), scattering loss can be reduced by a large detuning from the intermediate state. In this work, we show how electromagnetically induced transparency adjacent to the Raman absorption line plays a crucial role in reducing scattering loss, so that maximum efficiency is in fact achieved at a moderate detuning. Furthermore, the effectiveness of the transparency, and therefore the efficiency of GEM, depends on the order in which gradients are applied to store and recall the light. We provide a theoretical analysis and show experimentally how the efficiency depends on gradient order and detuning.

show abstract

Quantum memories and the double-slit experiment: implications for astronomical interferometry

2021

View full text Add to dashboard Cite

Thomas Young’s slit experiment lies at the heart of classical interference and quantum mechanics. Over the last 50 years, it has been shown that particles (e.g., photons, electrons, large molecules), even individual particles, generate an interference pattern at a distant screen after passage through a double slit, thereby demonstrating wave-particle duality. We revisit this famous experiment by replacing both slits with single-mode fiber inputs to two independent quantum memories that are capable of storing the incident electromagnetic field’s amplitude and phase as a function of time. At a later time, the action is reversed: the quantum memories are read out in synchrony, and the single-mode fiber outputs are allowed to interact, consistent with the original observation. In contrast to any classical memory device, the write and read processes of a quantum memory are non-destructive and hence preserve the photonic quantum states. In principle, with sufficiently long storage times and sufficiently high photonic storage capacity, quantum memories operating at widely separated telescopes can be brought together to achieve optical interferometry over arbitrarily long baselines.

show abstract

Echo‐Based Quantum Memory

Cited by 3 publications

References 86 publications

Quantum memories and the double-slit experiment: implications for astronomical interferometry

Quantum memories and the double-slit experiment: implications for astronomical interferometry

Electromagnetically-induced transparency assists the Raman gradient echo memory at moderate detuning, dependent on gradient order

Quantum memories and the double-slit experiment: implications for astronomical interferometry

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