Pack your suitcase for the future
- Overview
- Key Features
- Photon Source
- Experiments
- Optical Tokens
- Videos
- Links
The key feature is its flexibility with regard to generation and detection of visible laser light, single photons and even entangled pairs. Its optical elements, mechanical components and digital circuits are integrated in order to cover a range of experiments and topics of quantum physics as wide as possible.
For further informations at quantenkoffer.com.
Key Features
For further informations at quantenkoffer.com.
Animated Entangled Photon Source
SPDC generates entangled photon pairs
The heart of the quED and Quantenkoffer is made out of β-Barium-Borate (BBO), a special optical non-linear crystal. A high power UV diode laser at 405 nm wavelength, called the pump laser, is focused in this crystal. If the polarization of the pump beam and the axis of the BBO crystal are matched in a way enabling energy and momentum conservation, some of the pump photons are converted into two lower energy near infrared photons at 810 nm. These down con-verted photons then emerge at opposite sides of a so-called emission cone and form a photon pair.
Even though the conversion rate is low (only about 1 of 100.000.000.000 pump photons is converted), these photon pairs are quite useful, since whenever you observe a photon on one side, you know that there must be one on the other side, too! Therefore, you call them heralded single photons, and they can then be used in further experiments.
It becomes even more interesting if you add another BBO crystal with the optical axis perpendicular to the first one, condition the pump laser polarization by inserting a half wave plate (HWP) and compensate some temporal shifts and dispersion effects by two Ytterbium Vanadate (YVO) crystals: The photon pairs from the two crystals are coherently overlapped, so one cannot distinguish between pairs originated from the first or second crystal.
This is the condition for creating polarization entanglement between the photons of one such pair.
See also the brochure of the quED for more information.
For further informations at quantenkoffer.com.
Experiments
The Quantenkoffer and its modular design offer different approaches. You can choose to follow ideas and well-known experiments from 100 years of quantum physics, or you can use its intuitive software and design experiments from scratch.
Here is a list of the prepared experiments you can performe.
Single Photon Experiments without Interference
Single Photon Experiments with Interference
Photon Pair Experiments with Polarisation Entanglement
Photon Pair Experiments without Polarisation Entanglement
These are the experiments we have come up with so far and found interesting enough to put them here. Do you have more ideas? Please let us know!
For further informations at quantenkoffer.com.
Optical Tokens
Several optical tokens can be freely placed on the board and combined into various experiments. In addition to optical elements, the tokens contain sensors and microprocessors through which the Quantenkoffer can recognize, readout and digitally control them.
For further informations at quantenkoffer.com.
Videos
Downloads
Quantenkoffer brochure | 10/2021 | 1.7 MB |
Web
For further informations at quantenkoffer.com.
Spontaneous parametric down-conversion | 05/2021 | animation |