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Experimental certification of level dynamics in single-photon emitters
Luk\' aš Lachman, Ilya P. Radko, Maxime Bergamin +2
Emitters of single-photons are essential resources for emerging quantum technologies and developed within different platforms including nonlinear optics, atomic and solid-state sys…
Continuous-variable quantum passive optical network
Adnan A. E. Hajomer, Ivan Derkach, Radim Filip +3
Building scalable and secure quantum networks with many users has a high application potential but also holds many practical challenges. A significant stride in this pursuit involv…
Multi-Gbps quantum randomness source based on direct detection and vacuum states
Dino Solar Nikolic, Cosmo Lupo, Runjia Zhang +3
Quantum random number generators (QRNGs) based on quadrature measurements of the vacuum have so far used balanced homodyne detection to obtain a source of high entropy. Here we pro…
Fully guided and phase locked Ti:PPLN waveguide squeezing for applications in quantum sensing
Renato Domeneguetti, Michael Stefszky, Harald Herrmann +4
This work reports a fully guided setup for single-mode squeezing generation on integrated titanium-indiffused periodically poled nonlinear resonators. A continuous wave laser beam…
Continuous-Variable Quantum Key Distribution at 10 GBaud using an Integrated Photonic-Electronic Receiver
Adnan A. E. Hajomer, Cedric Bruynsteen, Ivan Derkach +6
Quantum key distribution (QKD) is a well-known application of quantum information theory that guarantees information-theoretically secure key exchange. As QKD becomes more and more…
Long-distance continuous-variable quantum key distribution over 100 km fiber with local local oscillator
Adnan A. E. Hajomer, Ivan Derkach, Nitin Jain +3
Quantum key distribution (QKD) enables two remote parties to share encryption keys with security based on the laws of physics. Continuous variable (CV) QKD with coherent states and…
Squeezed Light Coexistence with Classical Communication over 10 km Optical Fiber
Adnan A. E. Hajomer, Huy Q. Nguyen, Melis Pahalı +2
We report the first coexistence experiment of 1550 nm single-mode squeezed states of light with a 1310 nm classical telecom channel over a 10 km fiber channel while measuring squee…
High-rate continuous-variable measurement device-independent quantum key distribution with finite-size security
Adnan A. E. Hajomer, Ulrik L Andersen, Tobias Gehring
Building scalable and secure quantum networks requires advanced quantum key distribution (QKD) protocols that support multi-user connectivity. Continuous-variable (CV) measurement-…
Long Distance Nonlocality Test with Entanglement Swapping and Displacement-Based Measurements
Anders J. E. Bjerrum, Jonatan B. Brask, Jonas S. Neergaard-Nielsen +1
We analyze an all-optical setup which enables Bell-inequality violation over long distances by exploiting probabilistic entanglement swapping. The setup involves only two-mode sque…
Quantum Repeater using Two-Mode Squeezed States and Atomic Noiseless Amplifiers
Anders J. E. Bjerrum, Jonatan B. Brask, Jonas S. Neergaard-Nielsen +1
We perform a theoretical investigation into how a two-mode squeezed vacuum state, that has undergone photon loss, can be stored and purified using noiseless amplification with a co…
Machine learning based joint polarization and phase compensation for CV-QKD
Hou-Man Chin, Adnan E. Hajomer, Nitin Jain +2
We investigated a machine learning method for joint estimation of polarization and phase for use in a Gaussian modulated CV-QKD system, over an 18 hour period measured on a install…
Sensing of magnetic field effects in radical-pair reactions using a quantum sensor
Deepak Khurana, Rasmus H. Jensen, Rakshyakar Giri +4
Magnetic field effects (MFE) in certain chemical reactions have been well established in the last five decades and are attributed to the evolution of transient radical-pairs whose…
Mechanical cooling and squeezing using optimal control
Frederik Werner Isaksen, Ulrik Lund Andersen
A mechanical system can be optimally controlled through continuous measurements of its position followed by feedback. We revisit the complete formalism for predicting the performan…
Continuous-Variable Quantum Key Distribution Over 60 km Optical Fiber With Real Local Oscillator
Adnan A. E. Hajomer, Hossein Mani, Nitin Jain +3
We report the first continuous-variable quantum key distribution experiment that enables the generation of secure key over a 60 km fiber channel with locally generated local oscill…
Quantum Rabi interferometry of motion and radiation
Kimin Park, Petr Marek, Ulrik L. Andersen +1
The precise determination of a displacement of a mechanical oscillator or a microwave field in a predetermined direction in phase space can be carried out with trapped ions or supe…
Digital synchronization for continuous-variable quantum key distribution
Hou-Man Chin, Nitin Jain, Ulrik L. Andersen +1
Continuous variable quantum key distribution (CV-QKD) is a promising emerging technology for the distribution of secure keys for symmetric encryption. It can be readily implemented…
40 km Fiber Transmission of Squeezed Light Measured with a Real Local Oscillator
Iyad Suleiman, Jens Arnbak Holbøll Nielsen, Xueshi Guo +4
We demonstrate the generation, 40 km fiber transmission, and homodyne detection of single-mode squeezed states of light at 1550 nm using real-time phase control of a locally genera…
Analysis of loss correction with the Gottesman-Kitaev-Preskill code
Jacob Hastrup, Ulrik L. Andersen
The Gottesman-Kitaev-Preskill (GKP) code is a promising bosonic quantum error-correcting code, encoding logical qubits into a bosonic mode in such a way that many physically releva…
Deterministic quantum phase estimation beyond the ideal NOON state limit
Jens Arnbak Holbøll Nielsen, Jonas Schou Neergaard-Nielsen, Tobias Gehring +1
The measurement of physical parameters is one of the main pillars of science. A classic example is the measurement of the optical phase enabled by optical interferometry where the…
Steering-based randomness certification with squeezed states and homodyne measurements
Marie Ioannou, Bradley Longstaff, Mikkel V. Larsen +5
We present a scheme for quantum randomness certification based on quantum steering. The protocol is one-sided device independent, providing high security, but requires only states…
Practical continuous-variable quantum key distribution with composable security
Nitin Jain, Hou-Man Chin, Hossein Mani +10
A quantum key distribution (QKD) system must fulfill the requirement of universal composability to ensure that any cryptographic application (using the QKD system) is also secure.…
Investigation and comparison of measurement schemes in the low frequency biosensing regime using solid-state defect centers
Andreas F. L. Poulsen, James L. Webb, Kirstine Berg-Sørensen +2
Ensembles of solid state defects in diamond make promising quantum sensors with high sensitivity and spatiotemporal resolution. The inhomogeneous broadening and drive amplitude var…
All-optical cat-code quantum error correction
Jacob Hastrup, Ulrik Lund Andersen
The cat code is a promising encoding scheme for bosonic quantum error correction as it allows for correction against losses--the dominant error mechanism in most bosonic systems. H…
High speed microcircuit and synthetic biosignal widefield imaging using nitrogen vacancies in diamond
James L. Webb, Luca Troise, Nikolaj W. Hansen +9
The ability to measure the passage of electrical current with high spatial and temporal resolution is vital for applications ranging from inspection of microscopic electronic circu…