QCi EPR-XX-YY Series Entanglement Source Module User Guide
- June 1, 2024
- QCi
Table of Contents
QCi EPR-XX-YY Series Entanglement Source Module
USER GUIDE
EPR-XX-YY Series Entanglement Source
Key element to practical quantum networking and quantum sensing
Sources for generating entangled photons are critical for quantum computing,
provably quantum secure cryptography, and quantum-enhanced metrology. OCl’s
general purpose source EPR-XX-YY allows users to generate entangled photons
for their specific applications. OCl’s entanglement source utilizes a fiber
coupled periodically poled lithium niobate crystal that produces via
Spontaneous Parametric Down-Conversion (SPDC) broadband entangled photons
across the entire telecom
C-band. OCl’s source is highly customizable, robust, compact, and suitable for
both academics and industrial applications.
Figure 1 (a) illustrates the SPDC process, a phenomenon in quantum optics where a single photon, known as the ‘pump photon’, of higher energy, converts into a pair of photons known as signal photon and idler photon. This conversion process obeys the conservation of energy and momentum. Figure 1(b) shows the conceptual diagram of entangled photon pairs (pairs are visualized by red dashed lines) from the SPDC processes. From the incident pump light in the visible band (775.1 nm), photon pairs are simultaneously produced under the quasi-phase matching condition, in which signals and idlers are generated across the entire telecom C-band. Energy conservation requires that for the photons holds
Entangled photon generator for telecom C-band Supports high dimensional encoding plug and play system
Applications
- Quantum Key Distribution
- Quantum Authentication
- Quantum Metrology
- Quantum Networking
- Time Synchronization System
- Fundamental Physics Studies
Advantages
QCl’s entangled photon source uses spontaneous parametric down-conversion
(SPDC) in a quasi-phase-matched lithium niobate waveguide to create pairs of
energy-time entangled photons at telecom wavelengths. It covers the entire
telecom C-band thus it supports the existing fiber-optic communication
infrastructure. With an integrated 775 nm pump laser, this fiber-coupled
source produces >60 million photon pairs per second. Our entangled photon
source can achieve a zero-time delay second-order correlation function 19(2)
(“c = o) thus producing high-brightness heralded single-photon source ideal
for quantum optics applications. The QCl’s integrated solution offers the
generation of
(customizable) transform-limited single photons over the c-band, essential for
quantum networks applications in quantum computing, provably secure
cryptography, and quantum-enhanced metrology.
Our rackmountable entangled photon source demonstrates remarkable stability over more than 12 hours, enduring prolonged periods of reliable entanglement. Our source’s brightness enables its operation in photon starved environments, making it resilient for both fiber and free space transmission across extensive distances. Utilizing either their polarization or time-frequency entanglement, the photon pairs form our source can be used for a myriad of applications
Specifications
| Generation rate (pairs/power/ unit time) | 5 million pairs/1uW/s |
|---|---|
| Coincidence-to-accidental count (CAR) | -180 |
| Wavelength ranges | 1534.3 nm – 1566.4 nm |
| Operating temperature | 15 C to 55 C |
| Laser pump source | 775 nm |
Characterization
1. Laser power vs intrinsic count rate (16 pairs)
The above figure shows the pump laser power vs the idler intrinsic counts rate, in which the count rate is integrated among all 16 entanglement pairs.
2. Counts rate (one idler) stability over time with the pump power at 12 uW.
3. CAR stability over time (1 pair)
EPR-XX-YY
XX| IT: integrated module
ST: standalone module
---|---
YY| No number for standalone
Number of channels, from 2 to 48
Mechanical
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