Band-selective shaped pulse for high fidelity quantum control in diamond

• Published in: Applied physics letters 2014-06, Vol.104 (26)
• Main Authors: Chang, Yan-Chun, Xing, Jian, Zhang, Fei-Hao, Liu, Gang-Qin, Jiang, Qian-Qing, Li, Wu-Xia, Gu, Chang-Zhi, Long, Gui-Lu, Pan, Xin-Yu
• Format: Article
• Language: English
• Subjects: Applied physics; CARBON 13; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CONTROL; DIAMONDS; Electron spin; ELECTRONS; EXCITATION; INTERACTIONS; NITROGEN 14; Nuclear spin; PULSES; QUANTUM COMPUTERS; Quantum computing; Quantum phenomena; Quantum theory; QUBITS; Qubits (quantum computing); SPIN; VACANCIES
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.4885772

High fidelity quantum control of qubits is crucially important for realistic quantum computing, and it becomes more challenging when there are inevitable interactions between qubits. We introduce a band-selective shaped pulse, refocusing BURP (REBURP) pulse, to cope with the problems. The electron spin of nitrogen-vacancy centers in diamond is flipped with high fidelity by the REBURP pulse. In contrast with traditional rectangular pulses, the shaped pulse has almost equal excitation effect in a sharply edged region (in frequency domain). So the three sublevels of host 14N nuclear spin can be flipped accurately simultaneously, while unwanted excitations of other sublevels (e.g., of a nearby 13C nuclear spin) is well suppressed. Our scheme can be used for various applications such as quantum metrology, quantum sensing, and quantum information process.