2020 Fiscal Year Annual Research Report
Accelerated quantum control methods
| Project/Area Number |
19F19028
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
NORI FRANCO 国立研究開発法人理化学研究所, 開拓研究本部, 主任研究員 (50415262)
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| Co-Investigator(Kenkyū-buntansha) |
CHEN YEHONG 国立研究開発法人理化学研究所, 開拓研究本部, 外国人特別研究員
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| Project Period (FY) |
2019-10-11 – 2022-03-31
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| Keywords | quantum electrodynamics / ultrastrong coupling / quantum control methods |
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| Outline of Annual Research Achievements |
1. We have proposed a protocol to simulate the shortcuts to adiabatic dynamics of a cavity quantum electrodynamics system in the strong coupling regime. Our protocol can rapidly prepare a maximally entangled cat state in the lab frame via parametric amplification. Using a large-detuned Jaynes-Cummings model makes our protocol robust against the imperfection of the evolution time. This protocol is the first application of the shortcuts to adiabatic protocols for the Rabi model that can find wide applications in studying light-matter interactions.
2. We have investigated the possibility of using ultrastrong coupling systems for the implementation of fast, robust, and fault-tolerant holonomic computation. In this protocol, the binomial codes, formed by superposition of Fock states, can greatly save physical resources to correct errors in quantum computation. We apply to the system strong driving fields designed by shortcuts-to-adiabatic methods. This reduces the gate time to tens of nanoseconds. Noise induced by control imperfections can be suppressed by a systematic-error-sensitivity nullification method. As a result, this protocol can rapidly generate hardware-efficient, fault-tolerant, and high-fidelity quantum gates.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The project is progressing very well though we have spent a lot of time working from home due to the pandemic of COVID-19. Based on our results of research, we have written three manuscripts, and two of which have been published in top journals. One manuscript has been published in the journal of Physical Review Letters (IF: 8.3). The other one has been published in the journal of Nanophotonics (IF: 7.5). We also collaborated with other groups and finished two manuscripts, one of which has been published in the journal of Optics Letters (IF: 3.7).
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| Strategy for Future Research Activity |
1. We are planning to study the possibility of using cat qubits for nonadiabatic quantum holonomic computation which can provide protection from cavity dephasing. We plan to use a two-photon driven Kerr nonlinearity and a weak single-photon drive to control a cat qubit and thus to realize the cat-code nonadiabatic holonomic quantum computation.
2. We are planning simulate the quantum Rabi model and its generalizations using cat qubits. The cat qubits which are robust against the cavity dephasing are good resources for quantum information processing. The quantum Rabi model in the ultrastrong coupling regime can lead to areas of unexplored physics and gives rise to many fascinating quantum phenomena, such as the asymmetry of vacuum Rabi splitting, nonclassical photon statistics, and superradiance transition. Using cat qubits to simulate the quantum Rabi model can make it much easier to observe these fascinating quantum phenomena in experiments.
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