Limits...
High efficiency coherent optical memory with warm rubidium vapour.

Hosseini M, Sparkes BM, Campbell G, Lam PK, Buchler BC - Nat Commun (2011)

Bottom Line: Here, we present results from a coherent optical memory based on warm rubidium vapour and show 87% efficient recall of light pulses, the highest efficiency measured to date for any coherent optical memory suitable for quantum information applications.We also show storage and recall of up to 20 pulses from our system.These results show that simple warm atomic vapour systems have clear potential as a platform for quantum memory.

View Article: PubMed Central - PubMed

Affiliation: ARC Centre of Excellence for Quantum Atom Optics, Department of Quantum Science, The Australian National University, Canberra, ACT 0200, Australia.

ABSTRACT
By harnessing aspects of quantum mechanics, communication and information processing could be radically transformed. Promising forms of quantum information technology include optical quantum cryptographic systems and computing using photons for quantum logic operations. As with current information processing systems, some form of memory will be required. Quantum repeaters, which are required for long distance quantum key distribution, require quantum optical memory as do deterministic logic gates for optical quantum computing. Here, we present results from a coherent optical memory based on warm rubidium vapour and show 87% efficient recall of light pulses, the highest efficiency measured to date for any coherent optical memory suitable for quantum information applications. We also show storage and recall of up to 20 pulses from our system. These results show that simple warm atomic vapour systems have clear potential as a platform for quantum memory.

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Related in: MedlinePlus

Implied quantum memory performance for coherent state storage.The quantum limit is calculated assuming the efficiency fitted to experimental data in Figure 4a(i) and equation (3).
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f5: Implied quantum memory performance for coherent state storage.The quantum limit is calculated assuming the efficiency fitted to experimental data in Figure 4a(i) and equation (3).

Mentions: for coherent states with average photon number [nmacr] and memory efficiency ηm. Given that our memory is linear, and assuming that no extra noise is added to the stored states, we can calculate the range of coherent amplitudes for which it can fuction as a quantum memory, as shown in Figure 5. This shows, for example that we could store coherent states up to [nmacr] = 10 for times <6 μs, or states with [nmacr] = 1 for 21 μs.


High efficiency coherent optical memory with warm rubidium vapour.

Hosseini M, Sparkes BM, Campbell G, Lam PK, Buchler BC - Nat Commun (2011)

Implied quantum memory performance for coherent state storage.The quantum limit is calculated assuming the efficiency fitted to experimental data in Figure 4a(i) and equation (3).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3105315&req=5

f5: Implied quantum memory performance for coherent state storage.The quantum limit is calculated assuming the efficiency fitted to experimental data in Figure 4a(i) and equation (3).
Mentions: for coherent states with average photon number [nmacr] and memory efficiency ηm. Given that our memory is linear, and assuming that no extra noise is added to the stored states, we can calculate the range of coherent amplitudes for which it can fuction as a quantum memory, as shown in Figure 5. This shows, for example that we could store coherent states up to [nmacr] = 10 for times <6 μs, or states with [nmacr] = 1 for 21 μs.

Bottom Line: Here, we present results from a coherent optical memory based on warm rubidium vapour and show 87% efficient recall of light pulses, the highest efficiency measured to date for any coherent optical memory suitable for quantum information applications.We also show storage and recall of up to 20 pulses from our system.These results show that simple warm atomic vapour systems have clear potential as a platform for quantum memory.

View Article: PubMed Central - PubMed

Affiliation: ARC Centre of Excellence for Quantum Atom Optics, Department of Quantum Science, The Australian National University, Canberra, ACT 0200, Australia.

ABSTRACT
By harnessing aspects of quantum mechanics, communication and information processing could be radically transformed. Promising forms of quantum information technology include optical quantum cryptographic systems and computing using photons for quantum logic operations. As with current information processing systems, some form of memory will be required. Quantum repeaters, which are required for long distance quantum key distribution, require quantum optical memory as do deterministic logic gates for optical quantum computing. Here, we present results from a coherent optical memory based on warm rubidium vapour and show 87% efficient recall of light pulses, the highest efficiency measured to date for any coherent optical memory suitable for quantum information applications. We also show storage and recall of up to 20 pulses from our system. These results show that simple warm atomic vapour systems have clear potential as a platform for quantum memory.

Show MeSH
Related in: MedlinePlus