The science of quantum information has arisen over the last two decades centered on the
manipulation of individual quanta of information, known as quantum bits or qubits. Quantum …

No-cloning theorem is fundamental for quantum mechanics and for quantum information
science that states an unknown quantum state cannot be cloned perfectly. However, we can …

We prove that Gaussian operations are of no use for protecting Gaussian states against
Gaussian errors in quantum communication protocols. Specifically, we introduce a new …

Bosonic cat qubits stabilized with a driven two-photon dissipation are systems with
exponentially biased noise, opening the door to low-overhead, fault-tolerant, and universal …

We derive the class of covariant measurements that are optimal according to the maximum
likelihood criterion. The optimization problem is fully resolved in the case of pure input …

The history of quantum cloning can be traced back to the controversial story of a paper by
Herbert [1982] entitled “FLASH–A superluminal communicator based upon a new kind of …

The distribution of the quantum states to remote receivers is an indispensable technology in
quantum communication, quantum networks, and quantum information processing. Perfect …

The utilization of time-reversal symmetry in designing and implementing (quantum) optical
experiments has become more and more frequent over the last few years. We review the …

We report the first experimental demonstration of continuous variable cloning of phase-
conjugate coherent states as proposed by Cerf and Iblisdir [Phys. Rev. Lett. 87, 247903 …

The quantum fluctuations and correlations of the output signal and idler beams from a type-II
polarization nondegenerate optical parametric amplifier (NOPA) inside an optical cavity are …