Abstract
We propose and demonstrate a novel approach for controlling the temporal position of the biphoton correlation function using pump frequency tuning and dispersion cancellation; precise waveguide engineering enables biphoton generation at different pump frequencies while the idea of nonlocal dispersion cancellation is used to create the relative signal-idler delay and simultaneously prevents broadening of their correlation. Experimental results for delay shifts up to ±15 times the correlation width are shown along with discussions of the performance metrics of this approach.
Highlights
Entangled quantum-optical states offer unique potential in a range of applications, from secure communications [1, 2] and high-speed computing [3, 4] to quantum teleportation [5,6,7] and enhanced metrology [8, 9]
Since we send both photons through the same fiber and recombine them via sum-frequency generation (SFG) for detection, this proof-of-concept experiment is in some sense “local,” rather than an example of truly nonlocal dispersion cancellation
We have described and demonstrated a new way to tune the temporal position of the secondorder correlation function for entangled photons
Summary
Entangled quantum-optical states offer unique potential in a range of applications, from secure communications [1, 2] and high-speed computing [3, 4] to quantum teleportation [5,6,7] and enhanced metrology [8, 9]. Since different frequencies propagate at distinct group velocities through a dispersive medium, the amount of wavelength shift applied to the input field (either through electro-optic modulation or nonlinear mixing) maps directly to the delay of the output; by tuning the frequency shift, it is possible to modulate the applied delay, in some cases with GHz switching speeds [29]. This delay comes at a price: dispersion shifts the arrival time, and causes the pulse to spread. Our delay control method can be applied for obtaining a wide range of delays, but we focus on picosecond-scale control in these experiments
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