A few days ago, the research team of Qike Quantum and Sun Yat-sen University collaborated to use PT symmetric ion trap qubitsImplement the quantum velocity limit (QSL) in open systems(Refer to the preprint [1]) and provide a theoretical explanation from the perspective of the Bloch sphere, thus opening up new possibilities in the field of quantum computing and expanding the boundaries of quantum state manipulation.
Based on this research, the Qike quantum engineering team adopted this method to improve the quantum logic gate speed of trapped-ion quantum computers, and it was successfulIt is applied to the newly developed new generation of trapped-ion quantum computing engineering machine
QSL plays a crucial role in the fields of quantum computing, quantum communication, quantum metrology, quantum non-equilibrium thermodynamics, and quantum coherent control, and the exploration of QSL can help solve many interesting problems in open systems, such as whether the acceleration of state evolution can also increase the generation rate of entanglement, and whether the energy cost of state evolution can be minimized by achieving QSL. In recent years, a large number of theoretical studies have been devoted to exploring the fastest evolution rate of open quantum systems.
The research team introduced dissipative lasers into the ion trap to enhance the interaction between qubits and ambient energy to construct PT and antiPT Hamiltonians. Unlike optical cavity QED and NMR systems, the research team reported the QSL of a PT-symmetric system in an ion trap with controllable state-dependent dissipation coupled with the diagonal term of the HamiltonianFirst experimental study
Figure: Non-Hermitian state transfer of trapped-ion qubits.
The results of the experiment showed thatUnder the Pt symmetric and anti-Pt symmetric Hamiltonians, the evolution time of quantum states becomes shorter, and the evolution fidelity of quantum states is still more than 98%.
The results of this experiment are not only achieved on a single ytterbium (171yb+) ion qubit, but also on a single ytterbium (171yb+) ion qubitSuitable for long ion chain situationsThe engineering team has successfully verified the ion chain (with 50 ions) of the second-generation quantum computing engineering machine of Qike Quantum.
The results of this research are based on ".realizing quantum speed limit in open system with a pt-symmetric trapped-ion qubitIt will be published in the New Journal of Physics.
1] Preprint address: