# Quantum cryptography with highly entangled photons from semiconductor quantum dots

@article{Schimpf2020QuantumCW, title={Quantum cryptography with highly entangled photons from semiconductor quantum dots}, author={Christian Schimpf and Marcus Reindl and Daniel Huber and Barbara Lehner and Saimon Filipe Covre da Silva and Santanu Manna and Michal Vyvlecka and Philip Walther and Armando Rastelli}, journal={Science Advances}, year={2020}, volume={7} }

Fiber-based quantum cryptography between two buildings is demonstrated using entangled photons from a GaAs quantum dot. Semiconductor quantum dots are capable of emitting polarization entangled photon pairs with ultralow multipair emission probability even at maximum brightness. Using a quantum dot source with a fidelity as high as 0.987(8), we implement here quantum key distribution with an average quantum bit error rate as low as 1.9% over a time span of 13 hours. For a proof of principle…

## 39 Citations

### Entanglement-based quantum key distribution with a blinking-free quantum dot operated at a temperature up to 20 K

- PhysicsAdvanced Photonics
- 2021

Entanglement-based quantum key distribution promises enhanced robustness against eavesdropping and compatibility with future quantum networks. Among other sources, semiconductor quantum dots can…

### Enhancing quantum cryptography with quantum dot single-photon sources

- Physics, Computer Sciencenpj Quantum Information
- 2022

This work identifies the optimal optical pumping scheme for the main quantum-cryptographic primitives, and elaborate on the advantage of using phonon-assisted and two-photon excitation rather than resonant excitation for quantum key distribution and other primitives.

### Quantum interference between independent solid-state single-photon sources separated by 300 km fiber

- Physics
- 2021

In the quest to realize a scalable quantum network, semiconductor quantum dots (QDs) offer distinct advantages including high single-photon efficiency and indistinguishability, high repetition rate…

### Free‐Space Quantum Key Distribution with Single Photons from Defects in Hexagonal Boron Nitride

- PhysicsAdvanced Quantum Technologies
- 2022

Efficient single photon generation is an important requirement for several practical applications in quantum technologies, including quantum cryptography. A proof‐of‐concept demonstration of…

### Quantum Communication Using Semiconductor Quantum Dots

- PhysicsAdvanced Quantum Technologies
- 2022

Worldwide, enormous efforts are directed toward the development of the so‐called quantum internet. Turning this long‐sought‐after dream into reality is a great challenge that will require…

### Two-Photon Excitation Sets Fundamental Limit to Entangled Photon Pair Generation from Quantum Emitters

- Physics
- 2022

Entangled photon pairs are key to many novel applications in quantum technologies. Semiconductor quantum dots can be used as sources of on-demand, highly entangled photons. The ﬁdelity to a ﬁxed…

### Daylight entanglement-based quantum key distribution with a quantum dot source

- Physics
- 2022

Entanglement-based quantum key distribution can enable secure communication in trusted node-free networks and over long distances. Although implementations exist both in fiber and in free space, the…

### Two-Photon Excitation Sets Limit to Entangled Photon Pair Generation from Quantum Emitters.

- PhysicsPhysical review letters
- 2022

Entangled photon pairs are key to many novel applications in quantum technologies. Semiconductor quantum dots can be used as sources of on-demand, highly entangled photons. The fidelity to a fixed…

### A multipair-free source of entangled photons in the solid state

- Physics
- 2022

Unwanted multiphoton emission commonly reduces the degree of entanglement of photons generated by non-classical light sources and, in turn, hampers their exploitation in quantum information science…

### Advanced Laser Technology for Quantum Communications (Tutorial Review)

- Computer Science, PhysicsAdvanced Quantum Technologies
- 2021

This tutorial presents recent advances in laser modulation technologies that have enabled the development of efficient and versatile light sources for quantum communications, with a particular focus on quantum key distribution (QKD).

## References

SHOWING 1-10 OF 68 REFERENCES

### Highly-efficient extraction of entangled photons from quantum dots using a broadband optical antenna

- PhysicsNature Communications
- 2018

High extraction efficiency through a broadband dielectric photonic antenna is demonstrated and a highly-efficient entangled-photon source is demonstrated by collecting strongly entangled photons at a pair efficiency of 0.002 per pulse.

### Quantum key distribution with an entangled light emitting diode

- Physics, Computer Science
- 2015

Here, a quantum cryptography system based on an electrically driven entangled-light-emitting diode is realized and formation of an error-free quantum key is shown, which exceeds the threshold for quantum entanglement.

### Long-term transmission of entangled photons from a single quantum dot over deployed fiber

- PhysicsScientific Reports
- 2019

Stable transmission of polarization-encoded entanglement with a high fidelity of 91% is achieved, facilitating the operation of sub-Poissonian quantum light sources over existing fiber networks.

### Bright nanoscale source of deterministic entangled photon pairs violating Bell’s inequality

- PhysicsScientific Reports
- 2017

This work shows a bright photonic nanostructure generating polarization-entangled photon pairs that strongly violates Bell's inequality, and highlights their potential application in secure data communication utilizing measurement-device-independent quantum key distribution and quantum repeater protocols.

### Ultrabright source of entangled photon pairs

- PhysicsNature
- 2010

The results open the way towards the fabrication of solid state triggered sources of entangled photon pairs, with an overall efficiency of 80%, by coupling an optical cavity in the form of a ‘photonic molecule’ to a single quantum dot.

### Entanglement Swapping with Photons Generated on Demand by a Quantum Dot.

- PhysicsPhysical review letters
- 2019

A proof-of-concept demonstration of all-photonic entanglement swapping with pairs of polarization-entangled photons generated on demand by a GaAs quantum dot without spectral and temporal filtering is shown and a theoretical model that quantitatively reproduces the experimental data and provides insights on the critical figures of merit for the performance of the swapping operation is developed.

### A solid-state source of strongly entangled photon pairs with high brightness and indistinguishability

- PhysicsNature Nanotechnology
- 2019

An entangled photon pair source source is presented with high brightness and indistinguishability by deterministically embedding GaAs quantum dots in broadband photonic nanostructures that enable Purcell-enhanced emission.

### All-photonic quantum teleportation using on-demand solid-state quantum emitters

- PhysicsScience Advances
- 2018

On-demand solid-state quantum emitters are one of the most promising candidates to realize deterministic quantum teleportation in practical quantum networks and a theoretical framework is developed that matches the experimental observations and defines the degree of entanglement and indistinguishability needed to overcome the classical limit independently of the input state.

### Polarization-entangled photons from an InGaAs-based quantum dot emitting in the telecom C-band

- Physics
- 2017

We demonstrate the emission of polarization-entangled photons from a single semiconductor quantum dot in the telecom C-band (1530 nm–1565 nm). To reach this telecommunication window, the…

### Low-noise GaAs quantum dots for quantum photonics

- PhysicsNature communications
- 2020

This work embeds GaAs quantum dots into an n-i-p-diode specially designed for low-temperature operation and demonstrates ultra-low noise behaviour: charge control via Coulomb blockade, close-to lifetime-limited linewidths, and no blinking.