Calibration of Trapped-Ion Systems
This project was conducted at the Institute for Quantum
Computing, Baidu Inc., in collaboration with Dr. Jingbo Wang.
The work has culminated in the development of three patents:
-
C. Huang and J. Wang, "Ion trap chip
parameter correction method and device, electronic equipment
and medium,"
Chinese Patent
CN117454997, Granted 2025.
-
J. Wang and
C. Huang, "Ion trap chip parameter
determining method and device, electronic equipment and
medium,"
Chinese Patent
CN117371547, Granted 2024.
-
J. Wang and
C. Huang, "Ion trap chip parameter
calibration method and device, electronic equipment and
medium,"
Chinese Patent
CN117494829, Granted 2024.
Trapped-ion quantum computing, as one of the earliest
platforms to demonstrate quantum computation, has been under
development for over 30 years. From the initial demonstration
of Schrödinger's cat states to the creation of fully connected
qubit chips, the trapped-ion platform has consistently shown
great potential as a quantum computing hardware solution. The
fundamental principles of trapped-ion quantum computing are as
follows:
-
Qubit encoding:
Individual ions are used as qubits by leveraging different
energy levels within the ion. These levels often result from
orbital splitting, forming fine or hyperfine structures. The
ion's internal energy levels are typically rich and
non-equidistant, making them suitable for qubit encoding.
-
Qubit manipulation:
By carefully selecting specific laser frequencies and
applying precise laser techniques, the trapped-ion system
enables the preparation of initial quantum states, the
manipulation of qubit states, and the measurement of quantum
states.
-
Qubit coupling:
Since ions are charged particles, they interact with one
another through Coulomb forces, which include long-range
interaction terms. This natural property allows ions in a
quantum chip to form a fully connected network. Specially
tailored laser or microwave techniques can be used to
mediate interactions between any pair of qubits, granting
the trapped-ion platform its inherent full-connectivity
feature.
Vibration modes
Two-level approximation and Raman process
single-qubit gates
Two-qubit gates
Motivation
Calibration of phonon frequency
Calibration of Lamb-Dicke parameters