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A cavity-enhanced waveguide quantum memory . Hassan Mallahzadeh , Daniel Oblak , Neil Sinclair, Wolfgang Tittel Canadian Association of Physicists congress, Sudbury, Ontario June 19, 2014. The quest for an efficient optical quantum memory. Quantum Memory. - PowerPoint PPT Presentation
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A cavity-enhanced waveguide quantum memory
Hassan Mallahzadeh , Daniel Oblak, Neil Sinclair, Wolfgang Tittel
Canadian Association of Physicists congress, Sudbury, Ontario
June 19, 2014
|𝜓 1 ⟩ |𝜓 2 ⟩ |𝜓 3 ⟩ |𝜓 4 ⟩ |𝜓 5 ⟩ |𝜓 6 ⟩ |𝜓 7 ⟩ |𝜓 8 ⟩
The quest for an efficient optical quantum memory
|𝜓 1 ⟩ |𝜓 4 ⟩ |𝜓 5 ⟩ |𝜓 8 ⟩
|𝜓 ⟩ Quantum Memory |𝜓 ⟩
Nature Photonics 3, 706 - 714 (2009)
Frequency Comb memoryThe Mathematical Background
Fourier transform
Δt=Δν
Fourier transform
FrequencyTime
Frequency Comb memoryThe Physical Limitations
• Limited absorption pick height • Finite absorption pick width• Kramers-Kronig Relations
The cavity enhanced frequency comb memory
Memory
Front mirrorT=Round trip absorption Back mirror
R=100%.
f
dinput
output
Phys. Rev. A 82, 022310 (2010)Phys. Rev. Lett. 110, 133604 (2013)
The Atomic Frequency Comb (AFC) in rare earth ion doped crystals
• Very narrow homogenous line width (0.1-100KHz) at cryogenic temperatures(~<4k).,
Ti:Tm:LiNbO3
Phys. Rev. A 79, 052329 (2009)
The experiment’s layout
BS
Detector
Laser AOM PM
CryostatT<1k
Ti:Tm:LiNbO3
R=1
𝑅=(1.5−11.5+1 )2
=0.04
𝑅=( 2.2−12.2+1 )2
=0.14
Hole burning results
10 GHz
10 GHz
Have to be done:
• Make an AFC inside the cavity by hole burning on equal intervals
• Minimize the reflected light• Perform the experiment at single photon level
Backup slide
Fiber Crystal
R1=4%
R2=14%
R3=100%