EPS-1000

The entangled photon source (EPS) is an easy-to-use source of fiber-coupled polarization entangled photons in the 1550 nm band. The EPS-1000 generates polarization entangled signal-idler pairs as well as a sequence of polarized alignment signals to aid in aligning subsequent measurement equipment (measurement bases). There are many potential customizations for these systems, for instance the capability to generate up to four pairs of signal/idler wavelengths (DWDM option), reconfigurable pump wavelengths, user-selectable signal bandwidths, variable repetition rates, and GHz repetition rates, so please enquire about your particular needs.

Alignment Signal Operation - more information

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Basic Features

Fiber coupled Signal and idler photons on the DWDM ITU grid Built-in alignment signals to quickly compensate for fiber polarization transformations Computer controlled two-photon generation rate Optical and electrical clock output signals

Product Specifications

Attribute	Value	Units	Comments
Pulse Rate	50	MHz	Other rates including 1.25 GHz are available
Signal Wavelength: ITU grid selectable	1554.9	nm	Typically 1550.1 nm [100 GHz ITU ch 34], or ch 33,34,35, and 36 for DWDM option
Idler Wavelength: ITU grid selectable	1550.1	nm	Typically 1554.9 nm [ch 28], or ch 26,27,28, and 29 for DWDM option
Signal Photon 3-dB bandwidth	0.3	nm	Transform limited pulse
Idler Photon 3-dB bandwidth	0.3	nm	Transform limited pulse
Signal/Idler photon duration	5	ps
Pair-emission probability (p)	5·10-3−5·10-5	per pulse	Entanglement quality depends on p *
Fidelity (to a maximally entangled state)	92 (94, 98)	%	Nonlinear fiber at 25 ˚C (-80 ˚C, -210 ˚C)
TPI visibility (300K)	(90, 85)	%	(p ~ 0.0003, p ~ 0.001)
TPI visibility (77K)	(97, 93)	%	(p ~ 0.0005, p ~ 0.002)
Form Factor	3	U	3U 19" rack mountable chassis

* Example calculation of measured coincidence-count (CC) rate.
   Assume polarization analyzer transmittance = 0.7 and single photon detection efficiency = 20%. Setting p=1·10^-3 for a 50 MHz repetition rate will generate a
   coincidence measurement rate of 50 MHz · 1·10^-3 · (0.7·0.2)² ≈ 1 kHz;
- All specifications above are estimates and subject to change without notice

Typical Applications

Distribution of Entangled Photons over Fiber Quantum Cryptography Quantum Imaging (Ghost Imaging) Quantum Metrology

Product Photo & Diagram