A. E. Korolkov, I. V. Zalivako, A. S. Borisenko, V. N. Smirnov, P. A. Kamenskikh, I. A. Semerikov, K. Yu. Khabarova, N. N. Kolachevsky, “Preparation of multiparticle Greenberger–Horne–Zeilinger states on $^{171}$Yb$^+$ ions for frequency standards”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2025, Volume 121, Issue 10,Pages 852

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Preparation of multiparticle Greenberger–Horne–Zeilinger states on $^{171}$Yb$^+$ ions for frequency standards

A. E. Korolkov^ab, I. V. Zalivako^ab, A. S. Borisenko^ab, V. N. Smirnov^ba, P. A. Kamenskikh^ab, I. A. Semerikov^ba, K. Yu. Khabarova^ab, N. N. Kolachevsky^ba

^a Russian Quantum Center, Skolkovo, Moscow, 121205 Russia
^b Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia

Abstract: Greenberger–Horne–Zeilinger states on two to eight qubits in a chain of ten $^{171}$Yb$^+$ ions in a linear Paul trap has been prepared by executing a sequence of one- and two-qubit operations on the corresponding ions. The obtained states have been analyzed and their fidelity for the Greenberger–Horne–Zeilinger state on eight qubits has been estimated at $(58.9\pm 0.6)\%$. The expected increase in the sensitivity of parity oscillations as a function of the phase of the probe laser pulse has also been demonstrated. This result is an important step towards the creation of a multiparticle ytterbium ion optical clock with frequency averaging according to the law $1/N$ in contrast to the slower law $1/\sqrt N $ for an ensemble of independent particles in the case where decoherence is dominated by spontaneous decay.

Received: 07.04.2025
Revised: 24.04.2025
Accepted: 24.04.2025

DOI: 10.31857/S0370274X25050221