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6 papers · 2 filters
Efficient Amplification of Photonic Qubits by Optimal Quantum Cloning
Karol Bartkiewicz, Antonín Černoch, Karel Lemr +2
We demonstrate that a phase-independent quantum amplifier of a polarization qubit is a complementary amplifier of the heralded qubit amplifier [N. Gisin, S. Pironio and N. Sangouar…
State-dependent linear-optical qubit amplifier
Karol Bartkiewicz, Antonín Černoch, Karel Lemr
We propose a linear-optical setup for heralded qubit amplification with tunable output qubit fidelity. We study its success probability as a function of output qubit fidelity showi…
Direct quantum communication without actual transmission of the message qubits
Chitra Shukla, Anirban Pathak
Recently an orthogonal state based protocol of direct quantum communication without actual transmission of particles is proposed by Salih \emph{et al.}{[}Phys. Rev. Lett. \textbf{1…
Entanglement-based linear-optical qubit amplifier
Evan Meyer-Scott, Marek Bula, Karol Bartkiewicz +4
We propose a linear-optical scheme for an efficient amplification of a photonic qubit based on interaction of the signal mode with a pair of entangled ancillae. In contrast to a pr…
Optimal sub-Poissonian light generation from twin beams by photon-number resolving detectors
Marco Lamperti, Alessia Allevi, Maria Bondani +4
We generate nonclassical conditional states by exploiting the quantum correlations of multi-mode twin-beam states endowed with a sizeable number of photons. A strong relation betwe…
The Quantum Entropy Cone of Stabiliser States
Noah Linden, František Matúš, Mary Beth Ruskai +1
We investigate the universal linear inequalities that hold for the von Neumann entropies in a multi-party system, prepared in a stabiliser state. We demonstrate here that entropy v…