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Recovery-Free CHSH Nonlocality with Particle Loss
Giovanni Scala, Cosmo Lupo
Can CHSH nonlocality survive particle loss without applying an explicit recovery operation? In principle, any deterministic recovery can be absorbed into the measurement. Operation…
Preprocessing noise in finite-size quantum key distribution
Gabriele Staffieri, Giuseppe D'Ambruoso, Giovanni Scala +1
It is known that preprocessing noise may boost quantum key distribution by expanding the range of values of tolerated noise. For BB84, adding trusted noise may allow the generation…
Finite-size resource scaling for learning quantum phase transitions with fidelity-based support vector machines
Aaqib Ali, Giovanni Scala, Cosmo Lupo +1
Quantum kernels offer a valid procedure for learning quantum phase transitions on quantum processing devices, yet issues on the scalability of the learning strategy in connection w…
Finite-size security of QKD: comparison of three proof techniques
Gabriele Staffieri, Giovanni Scala, Cosmo Lupo
We compare three proof techniques for composable finite-size security of quantum key distribution under collective attacks, with emphasis on how the resulting secret-key rates beha…
Explicit construction of a 2-design of from the theory of angular momentum
Rocco Maggi, Cosmo Lupo, Saverio Pascazio
The main aim of this work is to present an explicit construction of a 2-design of , relying only on a tool that belongs to every physicists toolbox: the theory of angul…
Finite-size secret-key rates of discrete modulation continuous-variable quantum key distribution under Gaussian attacks
Gabriele Staffieri, Giovanni Scala, Cosmo Lupo
Quantum conditional entropies play a fundamental role in quantum information theory. In quantum key distribution, they are exploited to obtain reliable lower bounds on the secret-k…
Dynamical cluster-based strategy for improving tensor network algorithms in quantum circuit simulations
Andrea De Girolamo, Paolo Facchi, Peter Rabl +3
We optimize matrix-product state-based algorithms for simulating quantum circuits with finite fidelity, specifically the time-evolving block decimation (TEBD) and the density-matri…
Percolation thresholds and connectivity in quantum networks
Andrea De Girolamo, Giuseppe Magnifico, Cosmo Lupo
We study entanglement percolation in qubit-based planar quantum network models of arbitrary topology, where neighboring nodes are initially connected by pure states with quenched d…
Quantum-Optimal Frequency Estimation of Stochastic AC Fields
Anirban Dey, Sara Mouradian, Cosmo Lupo +1
Resolving frequencies in a time-dependent field is classically limited by the measurement bandwidth. Using tools from quantum metrology and quantum control may overcome this limit,…
Optimal and robust error filtration for quantum information processing
Aaqib Ali, Giovanni Scala, Cosmo Lupo
Error filtration is a hardware scheme that mitigates noise by exploiting auxiliary qubits and entangling gates. Although both signal and ancillas are subject to local noise, constr…
Machine learning with sub-diffraction resolution in the photon-counting regime
Giuseppe Buonaiuto, Cosmo Lupo
The resolution of optical imaging is classically limited by the width of the point-spread function, which in turn is determined by the Rayleigh length. Recently, spatial-mode demul…
Security of hybrid BB84 with heterodyne detection
Jasminder S. Sidhu, Rocco Maggi, Saverio Pascazio +1
Quantum key distribution (QKD) promises everlasting security based on the laws of physics. Most common protocols are grouped into two distinct categories based on the degrees of fr…
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…
Error filtration for quantum sensing via interferometry
Zixin Huang, Cosmo Lupo
Dephasing is a main noise mechanism that afflicts quantum information, it reduces visibility, and destroys coherence and entanglement. Therefore, it must be reduced, mitigated, and…
Single-photon sub-Rayleigh precision measurements of a pair of incoherent sources of unequal intensity
Luigi Santamaria Amato, Fabrizio Sgobba, Cosmo Lupo
Interferometric methods have been recently investigated to achieve sub-Rayleigh imaging and precision measurements of faint incoherent sources up to the ultimate quantum limit. Her…
Information theoretical perspective on the method of Entanglement Witnesses
Paulo J. Cavalcanti, Giovanni Scala, Antonio Mandarino +1
We frame entanglement detection as a problem of random variable inference to introduce a quantitative method to measure and understand whether entanglement witnesses lead to an eff…
Comparing metrics for mixed quantum states: Sjoqvist and Bures
Paul M. Alsing, Carlo Cafaro, Orlando Luongo +3
It is known that there are infinitely many distinguishability metrics for mixed quantum states. This freedom, in turn, leads to metric-dependent interpretations of physically meani…
Dynamical quantum phase transitions of the Schwinger model: real-time dynamics on IBM Quantum
Domenico Pomarico, Leonardo Cosmai, Paolo Facchi +3
Simulating real-time dynamics of gauge theories represents a paradigmatic use case to test the hardware capabilities of a quantum computer, since it can involve non-trivial input s…
Error-tolerant oblivious transfer in the noisy-storage model
Cosmo Lupo, James T. Peat, Erika Andersson +1
The noisy-storage model of quantum cryptography allows for information-theoretically secure two-party computation based on the assumption that a cheating user has at most access to…
100 Gbps Integrated Quantum Random Number Generator Based on Vacuum Fluctuations
Cedric Bruynsteen, Tobias Gehring, Cosmo Lupo +2
Emerging communication and cryptography applications call for reliable, fast, unpredictable random number generators. Quantum random number generation (QRNG) allows for the creatio…
Optical quantum super-resolution imaging and hypothesis testing
Ugo Zanforlin, Cosmo Lupo, Peter W. R. Connolly +3
Estimating the angular separation between two incoherent thermal sources is a challenging task for direct imaging, especially when it is smaller than or comparable to the Rayleigh…
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.…
Linear optics and photodetection achieve near-optimal unambiguous coherent state discrimination
Jasminder S. Sidhu, Michael S. Bullock, Saikat Guha +1
Coherent states of the quantum electromagnetic field, the quantum description of ideal laser light, are prime candidates as information carriers for optical communications. A large…
Quantum key distribution with non-ideal heterodyne detection: composable security of discrete-modulation continuous-variable protocols
Cosmo Lupo, Yingkai Ouyang
Continuous-variable quantum key distribution exploits coherent measurements of the electromagnetic field, i.e., homodyne or heterodyne detection. The most advanced security proofs…