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Professor Guido Burkard and his team of physicists from the University of Constance have developed a theoretical concept for realizing the processing of quantum information. Researchers have found ways to protect electrical and magnetic noise for a short time. This will make use of spins as memory for quantum computers because the coherence time is extended and several thousand computer operations can be performed during this interval. The study was published in the latest issue of the journal Letters of physical examination.
The technological vision of building a quantum computer does not depend solely on the computer and the information science. New knowledge in theoretical physics is also decisive for progress in practical implementation. Each computer or communication device contains information embedded in physical systems. "In the case of a quantum computer, we use for example spin qubits for the processing of information," says Professor Guido Burkard, who conducts research in cooperation with colleagues at the University of California. Princeton University. The theoretical conclusions that led to the current publication were largely formulated by the main author of the study, the doctoral researcher Maximilian Russ of the University of Constance.
In the quest for the quantum computer, spin qubits and their magnetic properties are at the center of all attention. To use spins as memory in quantum technology, they must be aligned, otherwise they can not be specifically controlled. "Usually, magnets are controlled by magnetic fields, like a compass needle in the Earth's magnetic field," says Guido Burkard. "In our case, the particles are extremely small and the magnets very weak, which makes their control very difficult." Physicists take up this challenge with electric fields and a procedure in which several electrons, in this case four, form a quantum bit. . Another problem they face is the rotation of the electrons, which are rather sensitive and fragile. Even in solid silicon bodies, they react to external interference with electrical or magnetic noise. The present study focuses on theoretical models and calculations of how quantum bits can be protected from this noise – an important contribution to fundamental research for a quantum computer: if this noise can be protected even the shortest, thousands Computer operations can be performed in these fractions of a second – at least theoretically.
The next step for physicists in Constance will now be to work with their experimental colleagues to test their theory experimentally. For the first time, four electrons instead of three will be used in these experiments, which could for example be implemented by research partners in Princeton. While physicists based in Konstanz provide the theoretical basis, collaborative partners in the United States perform the experimental part. This research is not the only reason why Konstanz is now on the map for qubit research.
More information:
Maximilian Russ et al. Quadrupole Exchange-Only Spin Qubit, Letters of physical examination (2018). DOI: 10.1103 / PhysRevLett.121.177701
Professor Guido Burkard and his team of physicists from the University of Constance have developed a theoretical concept for realizing the processing of quantum information. Researchers have found ways to protect electrical and magnetic noise for a short time. This will make use of spins as memory for quantum computers because the coherence time is extended and several thousand computer operations can be performed during this interval. The study was published in the latest issue of the journal Letters of physical examination.
The technological vision of building a quantum computer does not depend solely on the computer and the information science. New knowledge in theoretical physics is also decisive for progress in practical implementation. Each computer or communication device contains information embedded in physical systems. "In the case of a quantum computer, we use for example spin qubits for the processing of information," says Professor Guido Burkard, who conducts research in cooperation with colleagues at the University of California. Princeton University. The theoretical conclusions that led to the current publication were largely formulated by the main author of the study, the doctoral researcher Maximilian Russ of the University of Constance.
In the quest for the quantum computer, spin qubits and their magnetic properties are at the center of all attention. To use spins as memory in quantum technology, they must be aligned, otherwise they can not be specifically controlled. "Usually, magnets are controlled by magnetic fields, like a compass needle in the Earth's magnetic field," says Guido Burkard. "In our case, the particles are extremely small and the magnets very weak, which makes their control very difficult." Physicists take up this challenge with electric fields and a procedure in which several electrons, in this case four, form a quantum bit. . Another problem they face is the rotation of the electrons, which are rather sensitive and fragile. Even in solid silicon bodies, they react to external interference with electrical or magnetic noise. The present study focuses on theoretical models and calculations of how quantum bits can be protected from this noise – an important contribution to fundamental research for a quantum computer: if this noise can be protected even the shortest, thousands Computer operations can be performed in these fractions of a second – at least theoretically.
The next step for physicists in Constance will now be to work with their experimental colleagues to test their theory experimentally. For the first time, four electrons instead of three will be used in these experiments, which could for example be implemented by research partners in Princeton. While physicists based in Konstanz provide the theoretical basis, collaborative partners in the United States perform the experimental part. This research is not the only reason why Konstanz is now on the map for qubit research.
More information:
Maximilian Russ et al. Quadrupole Exchange-Only Spin Qubit, Letters of physical examination (2018). DOI: 10.1103 / PhysRevLett.121.177701
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