Optimal linear optical implementation of a single-qubit damping channel

Experimental linear - optical implementation of a multifunctional optimal qubit cloner SUPPLEMENTARY INFORMATION

SUPPLEMENTARY INFORMATION Karel Lemr,1, ∗ Karol Bartkiewicz,2, † Antonı́n Černoch,1 Jan Soubusta,3 and Adam Miranowicz2 RCPTM, Joint Laboratory of Optics of Palacký University and Institute of Physics of Academy of Sciences of the Czech Republic, Faculty of Science, Palacký University 17. listopadu 12, 771 46 Olomouc, Czech Republic Faculty of Physics, Adam Mickiewicz University, PL-61-614 Pozna...

Optimal Encoding Capacity of a Linear Optical Quantum Channel

Here, we study the capacity of a quantum channel, assuming linear optical encoding, as a function of available photons and optical modes. First, we observe that substantial improvement is made possible by not restricting ourselves to a rail-encoded qubit basis. Then, we derive an analytic formula for general channel capacity and show that this capacity is achieved without requiring the use of e...

Optical Qubit Using Linear Elements

In recent years, the quantum engineering of light have received much attention, which is mainly motivated by the potential improvement offered by quantum mechanics to the manipulation and the transmission of information. In particular, some conditional schemes have been suggested to prepare superpositions. Among these we mention the Fock filtering by an active Fabry-Perot cavity [1], the displa...

Single-qubit optical quantum fingerprinting.

We analyze and demonstrate the feasibility and superiority of linear optical single-qubit fingerprinting over its classical counterpart. For one-qubit fingerprinting of two-bit messages, we prepare "tetrahedral" qubit states experimentally and show that they meet the requirements for quantum fingerprinting to exceed the classical capability. We prove that shared entanglement permits 100% reliab...

Optimal discrimination of single-qubit mixed states