Center for Quantum Technologies of Moscow State University

In the Center for Quantum Technologies of the Physics Faculty of Moscow State University named after M.V. Lomonosov, quantum computers are created on two platforms - linear-optical and neutral atoms in optical traps.

The quantum processor on neutral atoms is based on a quantum register of single rubidium atoms captured in an array of optical tweezers. This technology allows you to create two-dimensional arrays of atoms with controlled interaction, which can be used as physical qubits. This technology allows you to create two-dimensional and three-dimensional ordered structures from more than 36 single rubidium atoms. Each atom plays the role of a physical qubit, sublayers of ultra-thin splitting of the ground state are used to encode logical states. Individual addressing is possible using auxiliary optical tweezers. The advantages of this solution: a reconfigurable structure of a quantum register, the ability to create three-dimensional structures, flexible configuration and the ability to program switch between "digital" and "analog" modes of operation.

The linear optical quantum chip is based on encoding information into quantum states of single photons. Multi-photon states are then converted using a programmable linear optical interferometer and detected at the output using single photon counters. The dimension of the logical state space in such a system can be very large, which makes it possible to realize computational superiority over classical computers in a number of tasks. The advantages of this platform are the low level of errors and decoherence of the states of photons, the large dimension of the space of states, the possibility of integral execution of most components of the system.