State-dependent linear-optical qubit amplifier
arXiv:1309.4724 · doi:10.1103/PhysRevA.88.062304
Abstract
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 showing that at the expense of lower fidelity, the setup can considerably increase probability of successful operation. These results are subsequently applied in a proposal for state dependent qubit amplification. Similarly to state-dependent quantum cloning, the a priori information about the input state allows to optimize the qubit amplification procedure to obtain better fidelity versus success probability trade-off.
8 pages, 7 figures
References in corpus (11)
- Free-Space distribution of entanglement and single photons over 144 km
- Optical Quantum Computing
- A Single-Atom Quantum Memory
- Proposal for Implementing Device-Independent Quantum Key Distribution based on a Heralded Qubit Amplification
- 2-GHz clock quantum key distribution over 260 km of standard telecom fiber
- Heralded photon amplification for quantum communication
- Two-qubit mixed states more entangled than pure states: Comparison of the relative entropy of entanglement for a given nonlocality
- Teleportation of qubit states through dissipative channels: Conditions for surpassing the no-cloning limit
- Entanglement-based linear-optical qubit amplifier
- Optimal mirror phase-covariant cloning
- Optimal cloning of qubits given by arbitrary axisymmetric distribution on Bloch sphere