186 citations · 506 across the 37 of their papers we have counts for
19 papers · 1 filter
The SWITCH test for discriminating quantum evolutions
Pedro Chamorro-Posada, Juan Carlos Garcia-Escartin
We propose a quantum circuit to discriminate between two arbitrary quantum evolution operators. It permits to test the equality of two quantum operators and to estimate a fidelity…
Simple quantum password checking
J. C. Garcia-Escartin, P. Chamorro-Posada
We present a quantum password checking protocol where secrecy is protected by the laws of quantum mechanics. The passwords are encoded in quantum systems that can be compared but h…
Quantum spread spectrum multiple access
Juan Carlos Garcia-Escartin, Pedro Chamorro-Posada
We describe a quantum multiple access scheme that can take separate single photon channels and combine them in the same path. We propose an add-drop multiplexer that can insert or…
A SWAP gate for qudits
Juan Carlos Garcia-Escartin, Pedro Chamorro-Posada
We present a quantum SWAP gate valid for quantum systems of an arbitrary dimension. The gate generalizes the CNOT implementation of the SWAP gate for qubits and keeps its most impo…
The SWAP test and the Hong-Ou-Mandel effect are equivalent
Juan Carlos Garcia-Escartin, Pedro Chamorro-Posada
We show that the Hong-Ou-Mandel effect from quantum optics is equivalent to the SWAP test, a quantum information primitive which compares two arbitrary states. We first derive a de…
Quantum computer networks with the orbital angular momentum of light
Juan Carlos Garcia-Escartin, Pedro Chamorro-Posada
Inside computer networks, different information processing tasks are necessary to deliver the user data efficiently. This processing can also be done in the quantum domain. We pres…