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Researchers Realize Solid-state Programmable Quantum Processor Under Ambient Conditions

Jan 31, 2019

A research team led by Prof. DU Jiangfeng at the University of Science and Technology of China (USTC) of Chinese Academy of Sciences (CAS) realized the first solid-state programmable quantum processor under room temperature. This study was published in npj Quantum Information.

Quantum computer is a promising technique that utilizes the superposition and entanglement of physical states. In most of the quantum computing experiments, their systems are only designed to run specific quantum algorithms. To solve this problem, the concept of programmable quantum computing is proposed. Instead of altering the hardware, this method enables the quantum processor to perform any given tasks by simply reconfiguring relative parameters.

In recent years, programmable quantum computation has been demonstrated using trapped ions, superconducting qubits and quantum-dot-based qubits. Nonetheless, considering the vulnerability of quantum coherence to noises, it remains a challenge to construct a solid-state programmable quantum processor under room temperature.

With the electronic spin and 14N nuclear spin of nitrogen-vacancy (NV) center in diamond acting as a two-qubit system, researchers were able to form a programmable quantum processor that can perform quantum algorithms under room temperature. They used green laser pulses to realize the initialization and readout of the quantum processor.

Meanwhile, taking advantage of the designed universal quantum circuit, researchers transformed the execution of a series of quantum algorithms into the corresponding amplitudes and phases of microwave and radio frequency pulses. Up to this point, running a variety of quantum algorithms without tedious and expensive hardware reconfiguration are allowed through effective configuration of relative parameters.

In the course of quantum algorithm executing process, researchers incorporated the previous developed dynamic decoupling technology, effectively suppressing the adverse effects of noises in solids. They implemented Deutsch-Jozsa and Grover search algorithms on the programmable quantum processor with average success rates above 80%.

In the future, a further increase of the quantum algorithm success rates is expected via improving the material (diamond) performance of the quantum processor (e.g. reducing the abundance of 13C isotope).

This study demonstrated the flexibility of programmable quantum processors, taking an important step on the construction of a room-temperature solid-state quantum computing system.

Contact

Jane FAN Qiong

University of Science and Technology of China

E-mail:

A programmable two-qubit solid-state quantum processor under ambient conditions

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