Hugo Zbinden
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View article: Integrated Telecom Wavelength Heralded Single-Photon Source based on GHz gated detectors
Integrated Telecom Wavelength Heralded Single-Photon Source based on GHz gated detectors Open
We introduce a simple and flexible concept for a heralded -- spectrally pure -- single photon source. The scheme uses a probabilistic photon pair source pumped with a CW laser, whereby a rapid gating InGaAs/InP single photon avalanche diod…
View article: Modulator-free, self-testing quantum random number generator
Modulator-free, self-testing quantum random number generator Open
Quantum random number generators (QRNGs) use the inherent unpredictability of quantum mechanics to generate true randomness, as opposed to classical random number generators. However, ensuring the authenticity of this randomness still requ…
View article: Quantum Keyless Private Communication under intense background noise
Quantum Keyless Private Communication under intense background noise Open
Quantum key distribution relies on quantum mechanics to securely distribute cryptographic keys, offering security but necessitating complex infrastructure and significant resources for practical implementation. Quantum keyless private comm…
View article: Enhanced Detection Rate and High Photon-Number Efficiencies with a Scalable Parallel SNSPD
Enhanced Detection Rate and High Photon-Number Efficiencies with a Scalable Parallel SNSPD Open
Since their inception, superconducting nanowire single-photon detectors have been enabling quantum optical applications and the rise of the photonic quantum industry. The evolution in the detector design and read-out strategies has led to …
View article: Toward heralded distribution of polarization entanglement
Toward heralded distribution of polarization entanglement Open
Distributing entangled states over potentially long distances provides a key resource for many protocols in quantum communication and quantum cryptography. Ideally, this should be implemented in a heralded manner. Starting with four single…
View article: Quantum Keyless Private Communication With Decoy States for Space Channels
Quantum Keyless Private Communication With Decoy States for Space Channels Open
With the increasing demand for secure communication in optical space\nnetworks, it is essential to develop physical-layer scalable security\nsolutions. In this context, we present the asymptotic security analysis of a\nkeyless quantum priv…
View article: Towards heralded distribution of polarization entanglement
Towards heralded distribution of polarization entanglement Open
Distributing entangled states over potentially long distances provides a key resource for many protocols in quantum communication and quantum cryptography. Ideally, this should be implemented in a heralded manner. By starting with four sin…
View article: High-efficiency photon-number-resolving detector for improving heralded single-photon sources
High-efficiency photon-number-resolving detector for improving heralded single-photon sources Open
Heralded single-photon sources (HSPS) intrinsically suffer from multiphoton emission, leading to a trade-off between the source’s single-photon quality and the heralding rate. A solution to this problem is to use photon-number-resolving (P…
View article: Integrated photon-pair source with monolithic piezoelectric frequency tunability
Integrated photon-pair source with monolithic piezoelectric frequency tunability Open
This work demonstrates the capabilities of an entangled photon-pair source at telecom wavelengths, based on a photonic integrated Si3N4 microresonator with monolithically integrated piezoelectric frequency tuning. Previously, frequency tun…
View article: High-speed integrated QKD system
High-speed integrated QKD system Open
Quantum key distribution (QKD) is nowadays a well-established method for generating secret keys at a distance in an information-theoretically secure way, as the secrecy of QKD relies on the laws of quantum physics and not on computational …
View article: GHz detection rates and dynamic photon-number resolution with superconducting nanowire arrays
GHz detection rates and dynamic photon-number resolution with superconducting nanowire arrays Open
Superconducting-nanowire single-photon detectors (SNSPDs) have enabled the realization of several quantum optics technologies thanks to their high detection efficiency, low dark-counts, and fast recovery time. However, the widespread use o…
View article: Fast single-photon detectors and real-time key distillation enable high secret-key-rate quantum key distribution systems
Fast single-photon detectors and real-time key distillation enable high secret-key-rate quantum key distribution systems Open
Quantum key distribution has emerged as the most viable scheme to guarantee information security in the presence of large-scale quantum computers and, thanks to the continuous progress made in the past 20 years, it is now commercially avai…
View article: High-speed integrated QKD system
High-speed integrated QKD system Open
Quantum key distribution (QKD) is nowadays a well established method for generating secret keys at a distance in an information-theoretic secure way, as the secrecy of QKD relies on the laws of quantum physics and not computational complex…
View article: Fast Single Photon Detectors and real-time Key Distillation: Enabling High Secret Key Rate QKD Systems
Fast Single Photon Detectors and real-time Key Distillation: Enabling High Secret Key Rate QKD Systems Open
Quantum Key Distribution has made continuous progress over the last 20 years and is now commercially available. However, the secret key rates (SKR) are still limited to a few Mbps. Here, we present a custom multipixel superconducting nanow…
View article: Enhanced heralded single-photon source with a photon-number-resolving parallel superconducting nanowire single-photon detector
Enhanced heralded single-photon source with a photon-number-resolving parallel superconducting nanowire single-photon detector Open
Heralded single-photon sources (HSPS) intrinsically suffer from multiphoton emission, leading to a trade-off between the source's quality and the heralding rate. A solution to this problem is to use photon-number-resolving (PNR) detectors …
View article: An Integrated Photon-Pair Source with Monolithic Piezoelectric Frequency Tunability
An Integrated Photon-Pair Source with Monolithic Piezoelectric Frequency Tunability Open
This work demonstrates the capabilities of an entangled photon-pair source at telecom wavelengths, based on a photonic integrated Si$_3$N$_4$ microresonator with monolithically integrated piezoelectric frequency tuning. Previously, frequen…
View article: Spatial Properties of Entangled Two-Photon Absorption
Spatial Properties of Entangled Two-Photon Absorption Open
We experimentally study entangled two-photon absorption in rhodamine 6G as a function of the spatial properties of a high flux of broadband entangled photon pairs. We first demonstrate a key signature dependence of the entangled two-photon…
View article: Long-range QKD without trusted nodes is not possible with current technology
Long-range QKD without trusted nodes is not possible with current technology Open
A recently published patent (https://www.ipo.gov.uk/p-ipsum/Case/PublicationNumber/GB2590064) has claimed the development of a novel quantum key distribution protocol purporting to achieve long-range quantum security without trusted nodes …
View article: High-efficiency and fast photon-number resolving parallel superconducting nanowire single-photon detector
High-efficiency and fast photon-number resolving parallel superconducting nanowire single-photon detector Open
Photon-number resolving (PNR) single-photon detectors are an enabling technology in many areas such as photonic quantum computing, non-classical light source characterisation and quantum imaging. Here, we demonstrate high-efficiency PNR de…
View article: Receiver-device-independent quantum key distribution
Receiver-device-independent quantum key distribution Open
We present protocols for quantum key distribution in a prepare-and-measure\nsetup with an asymmetric level of trust. While the device of the sender (Alice)\nis partially characterized, the receiver's (Bob's) device is treated as a\nblack-b…
View article: Receiver-Device-Independent Quantum Key Distribution
Receiver-Device-Independent Quantum Key Distribution Open
We present protocols for quantum key distribution in a prepare-and-measure setup with an asymmetric level of trust. While the device of the sender (Alice) is partially characterized, the receiver's (Bob's) device is treated as a …
View article: Local and scalable detection of genuine multipartite single-photon path entanglement
Local and scalable detection of genuine multipartite single-photon path entanglement Open
How can a multipartite single-photon path-entangled state be certified efficiently by means of local measurements? We address this question by constructing an entanglement witness based on local photon detections preceded by displacement o…
View article: The limits of multiplexing quantum and classical channels: Case study of a 2.5 GHz discrete variable quantum key distribution system
The limits of multiplexing quantum and classical channels: Case study of a 2.5 GHz discrete variable quantum key distribution system Open
Network integration of quantum key distribution is crucial for its future widespread deployment due to the high cost of using optical fibers dedicated for the quantum channel only. We studied the performance of a system running a simplifie…
View article: Operation of parallel SNSPDs at high detection rates
Operation of parallel SNSPDs at high detection rates Open
Recent progress in the development of superconducting nanowire single-photon detectors (SNSPD) has delivered ex-cellent performance, and their increased adoption has had a great impact on a range of applications. One of the key characteris…
View article: Local and scalable detection of genuine multipartite single-photon path entanglement
Local and scalable detection of genuine multipartite single-photon path entanglement Open
How can a multipartite single-photon path-entangled state be certified efficiently by means of local measurements? We address this question by constructing an entanglement witness based on local photon detections preceded by displacement o…
View article: Entanglement swapping between independent and asynchronous integrated photon-pair sources
Entanglement swapping between independent and asynchronous integrated photon-pair sources Open
Integrated photonics represents a technology that could greatly improve quantum communication networks in terms of cost, size, scaling, and robustness. A key benchmark for this is to demonstrate their performance in complex quantum network…
View article: Countermeasure Against Quantum Hacking Using Detection Statistics
Countermeasure Against Quantum Hacking Using Detection Statistics Open
Detector blinding attacks have been proposed in the last few years, and they\ncould potentially threaten the security of QKD systems. Even though no complete\nQKD system has been hacked yet, it is nevertheless important to consider\ncounte…