Speaker
Description
Trapped-ion quantum technology is among the most promising candidates for the realization of a scalable quantum processor. To address individual ions and perform high-fidelity two-qubit entangling gates in a linear segmented Paul trap, we employ dynamical register reconfiguration operations to place specific qubits in a laser interaction zone. To realize fault-tolerant quantum information processing, it is of crucial importance to be able to perform quantum error correction [1]. One essential building block is to perform error syndrome readout, which allows the detection of errors through quantum non-demolition parity check measurements on the encoded states [2]. Recently, the fault-tolerant weight-4 parity check measurement scheme on a shuttling-based trapped-ion quantum processing node has been experimentally demonstrated [3,4].
After a short introduction of the shuttling-based quantum information processing node the measurements were performed on, recent results of a fault-tolerant weight-4 parity check measurement are going to be presented, using four data and two ancilla qubits. The flag qubit is used to detect errors occurring during the syndrome readout circuit, which is an essential building block of multiple quantum error correction circuits, including topological color codes. A flag-conditioned single-shot fidelity of the syndrome readout of 93.2(2)% is achieved [3]. The error catch rate is determined by injection of bit and phase-flip errors at a critical position of the circuit, where the error does propagate onto two out of the four data qubits. Error catch rates of 90.6(6)% and 89.7(6)% are obtained, verifying the capability of the flag to detect the potentially detrimental weight-2 errors onto the data qubits. Additionally, the generation of six-qubit multipartite entanglement on all ions participating in this flag-based fault-tolerant parity readout circuit will be presented [3].
References
[1] A. Bermudez et al., Phys. Rev. X 7, 041061 (2017)
[2] A. Rodriguez-Blanco et al., PRX Quantum 2, 020304 (2021)
[3] J. Hilder et al., arXiv:2107.06368 [quant-ph] (2021)
[4] C. Ryan-Anderson et al., arXiv:2107.07505 [quant-ph] (2021)
