Communications of the ACM
Physicists Find a Way of 'bundling Together' Multiple Elements of a Quantum Computer
Physicists from the Moscow Institute of Physics and Technology and the Russian Quantum Center have developed a method of using multilevel quantum systems, or qudits, each one of which is able to work with multiple conventional quantum elements, or qubit
Credit: Vladimir Manko, Aleksey Fedorov, and Evgeny Kiktenko
Physicists from the Moscow Institute of Physics and Technology and the Russian Quantum Center (RQC) have discovered a way of using multilevel quantum systems (qudits), each of which is capable of working with multiple "conventional" quantum elements, or qubits.
The researchers say instead of trying to maintain the stability of a large qubit system, they attempted to increase the dimensions of the systems required for calculations.
Qudits are quantum objects in which the number of possible states, or levels, is greater than two.
RQC's Aleksey Fedorov and colleagues demonstrate that on one qudit with five levels, created using an artificial atom, it is possible to perform full quantum computations, in particular the realization of the Deutsch algorithm designed to test the values of a large number of binary variables. To run a two-qubit Deutsch algorithm, for example, the researchers proposed using a nuclear spin of 3/2 with four different states.
"We are making significant progress, because in certain physical implementations it is easier to control multilevel qudits than a system of the corresponding number of qubits, and this means that we are one step closer to creating a full-fledged quantum computer," Fedorov says.
From Moscow Institute of Physics and Technology
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