Abstract: We prove a lower bound on the information leakage of any classical protocol.

Computing the equality function in the simultaneous message passing (SMP) model. Our bound is valid in the finite length regime and is strong enough to demonstrate a quantum advantage in terms of information leakage for practical quantum protocols. We prove our bound by obtaining an improved finite size version of the communication bound due to Babai and Kimmel, relating randomized.

Communication to deterministic communication in the SMP model. We then relate. information leakage to randomized communication through a series of reductions.

We first provide alternative characterizations for information leakage, allowing us to link it to average length communication while allowing for. shared randomness (pairwise, with the referee). A Markov inequality links this.

With bounded length communication, and a Newman type argument allows us to go from shared to private randomness. The only reduction in which we incur more.

Age of Quantum Bit.

In computers of the future, information might be stored in the form of quantum bits. But how can a quantum bit be realized?

A research team from Germany, France and Switzerland has realized quantum bits, short qubits, in a new form. One day, they might become the information units of quantum computers.

To date, researchers have realized qubits in the form of individual electrons. However, this led to interferences and rendered the information carriers difficult to programme and read. The group has solved this problem by utilising electron holes as qubits, rather than electrons.

Physicists from MIPT and the Russian Quantum Center have developed a method which is going to make it easier to create a universal quantum computer — they have discovered a way of using multilevel quantum systems (qudits), each one of which is able to work with multiple “conventional” quantum elements — qubits.

Professor Vladimir Man’ko, Scientific Supervisor of MIPT’s Laboratory of Quantum Information Theory and member of staff at the Lebedev Physical Institute, Aleksey Fedorov, a member of staff at the Russian Quantum Center, and his colleague Evgeny Kiktenko published the results of their studies of multilevel quantum systems in a series of papers in Physical Review A, Physics Letters A, and also Quantum Measurements and Quantum Metrology.