Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 24: Quantum Information (Quantum Computing)

Q 24.4: Talk

Wednesday, March 11, 2020, 12:00–12:15, e001

Towards a Scalable Fault-Tolerant Ion-Based Quantum Processor — •Daniel Pijn, Janine Hilder, Alex Stahl, Max Orth, Alex Müller, Björn Lekitsch, Ferdinand Schmidt-Kaler, and Ulrich Poschinger — QUANTUM, Univ. Mainz, Institute of Physics, Staudingerweg 7, 55128 Mainz, Germany

We present steps towards the experimental realization of an error correction algorithm in a shuttling-based trapped-ion quantum processor. Ions are stored in a segmented linear Paul trap with one static laser interaction zone (LIZ). Addressed single- and two-qubit gate operations are performed by selectively transporting ions into the LIZ. The qubit register can be reconfigured by splitting, merging [1], and swapping [2] of ion crystals. Using this setup, we have previously prepared a four-qubit GHZ state [3], and used entangled ion pairs to measure magnetic field differences with a sensitivity of 12 pT / √Hz [4]. Current work aims at implementing a topological error correction circuit [5]. We measure stabilizer operators on four data qubits using an additional ancilla and flag qubit [6]. Alongside the latest results we discuss our efforts to maintain the required degree of qubit coherence.

[1] Walther et al., Phys. Rev. Lett. 109, 080501 (2012)

[2] Kaufmann et al., Phys. Rev. A 95, 052319 (2017)

[3] Kaufmann et al., Phys. Rev. Lett. 119, 150503 (2017)

[4] Ruster et al., Phys. Rev. X 7, 031050 (2017)

[5] Bermudez et al., Phys. Rev. X 7, 041061 (2017)

[6] Bermudez et al, arXiv: 1810.09199 [quant-ph]