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13 papers · 2 filters
The geometry of passivity for quantum systems and a novel elementary derivation of the Gibbs state
Nikolaos Koukoulekidis, Rhea Alexander, Thomas Hebdige +1
Passivity is a fundamental concept that constitutes a necessary condition for any quantum system to attain thermodynamic equilibrium, and for a notion of temperature to emerge. Whi…
Experimental quantum key distribution beyond the repeaterless secret key capacity
M. Minder, M. Pittaluga, G. L. Roberts +4
Quantum communications promise to revolutionise the way information is exchanged and protected. Unlike their classical counterpart, they are based on dim optical pulses that cannot…
Tight finite-key security for twin-field quantum key distribution
Guillermo Currás-Lorenzo, Alvaro Navarrete, Koji Azuma +3
Quantum key distribution (QKD) offers a reliable solution to communication problems that require long-term data security. For its widespread use, however, the rate and reach of QKD…
Quantum scars of bosons with correlated hopping
Ana Hudomal, Ivana Vasić, Nicolas Regnault +1
Recent experiments on Rydberg atom arrays have found evidence of anomalously slow thermalization and persistent density oscillations, which have been interpreted as a many-body ana…
Improvements on "Secure multi-party quantum summation based on quantum Fourier transform"
Cai Zhang, Mohsen Razavi, Zhewei Sun +1
Recently, a quantum multi-party summation protocol based on the quantum Fourier transform has been proposed [Quantum Inf Process 17: 129, 2018]. The protocol claims to be secure ag…
Free fermion representation of the topological surface code
Ashk Farjami
The toric code is known to be equivalent to free fermions. This paper presents explicit local unitary transformations that map the toric and surface code --- the ope…