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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…
Universal unitary transfer of continuous-variable quantum states into a few qubits
Jacob Hastrup, Kimin Park, Jonatan Bohr Brask +2
We present a protocol for transferring arbitrary continuous-variable quantum states into a few discrete-variable qubits and back. The protocol is deterministic and utilizes only tw…
Slowing quantum decoherence of oscillators by hybrid processing
Kimin Park, Jacob Hastrup, Jonas Schou Neergaard-Nielsen +3
Quantum information encoded into superposition of coherent states is an illustrative representative of practical applications of macroscopic quantum coherence possessing. However,…
Generation of optical Gottesman-Kitaev-Preskill states with cavity QED
Jacob Hastrup, Ulrik L. Andersen
Gottesman-Kitaev-Preskill (GKP) states are a central resource for fault-tolerant optical continuous-variable quantum computing and communication. However, their realization in the…
Modulation leakage vulnerability in continuous-variable quantum key distribution
Nitin Jain, Ivan Derkach, Hou-Man Chin +4
Flaws in the process of modulation, or encoding of key bits in the quadratures of the electromagnetic light field, can make continuous-variable quantum key distribution systems sus…
Optimal control of a nitrogen-vacancy spin ensemble in diamond for sensing in the pulsed domain
Andreas F. L. Poulsen, Joshua D. Clement, James L. Webb +4
Defects in solid state materials provide an ideal, robust platform for quantum sensing. To deliver maximum sensitivity, a large ensemble of non-interacting defects hosting coherent…
Laser threshold magnetometry using green light absorption by diamond nitrogen vacancies in an external cavity laser
James L. Webb, Andreas F. L. Poulsen, Robert Staacke +4
Nitrogen vacancy (NV) centers in diamond have attracted considerable recent interest for use in quantum sensing, promising increased sensitivity for applications ranging from geoph…
A fault-tolerant continuous-variable measurement-based quantum computation architecture
Mikkel V. Larsen, Christopher Chamberland, Kyungjoo Noh +2
Continuous variable measurement-based quantum computation on cluster states has in recent years shown great potential for scalable, universal, and fault-tolerant quantum computatio…