Experimental Study of the Optical Qubit on the 435-nm Quadrupole Transition in the 171Yb+ Ion

Zalivako, I. V.; Semerikov, I. A.; Борисенко, А.С.; Aksenov, Mikhail; Khabarova, K. Yu.; Kolachevsky, Nikolai N.

doi:10.1134/s0021364021140113

Cited by 14 publications

(9 citation statements)

References 27 publications

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“…The fidelity appears to be lower than in the optical qubit experiments (94 %) reported in Ref. [96]. We explain this by excessive heating of radial modes (above the Doppler limit) during the ground state cooling of axial modes.…”

Section: Realizing Of the Qudit Operationscontrasting

confidence: 59%

“…We realize a two-particle ion string and use four states in each ion, 2 S 1/2 (m F = 0) and 2 D 1/2 (m F = 0, ±1), for encoding two ququarts, which we further refer to as qudit A and qudit B. At the beginning of each experimental run ions are Doppler cooled for 5 ms, which brings the temperature of the ion crystal down to 1.7 mK [96]. Doppler cooling is achieved with diode lasers at 369.5 nm and 935.2 nm with electro-optical modulators (EOMs) at 14.7 GHz and 3.07 GHz, respectively, to avoid population trapping in metastable hyperfine components.…”

Section: Trapped-ion Quantum Processor With Optical Quditsmentioning

confidence: 99%

“…The discussion of the state preparation and measurement (SPAM) errors for our system in may be found in Ref. [96].…”

Section: Realizing Of the Qudit Operationsmentioning

confidence: 99%

“…In this work, we present a two-ququart quantum processor using 171 Yb + ions with the quadrupole clock transition at 435.5 nm used for efficient qudit encoding. This transition is widely used in metrology [92][93][94][95] and recently has been proposed for robust qubit encoding with ytterbium ions [96]. Here we extend this idea for encoding qudits.…”

Section: Introductionmentioning

confidence: 99%

“…In our previous work [96], we have proposed the electric quadrupole transition 2 S 1/2 (F = 0, m F = 0) → 2 D 3/2 (F = 2, m F = 0) in 171 Yb + to encode an optical qubit. This transition has a wavelength of 435.5 nm and the natural linewidth of 3 Hz (the corresponding upper level life time equals τ = 53 ms).…”

Section: Introductionmentioning

confidence: 99%

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Realizing quantum gates with optically-addressable $^{171}$Yb$^{+}$ ion qudits

Aksenov¹,

V.²,

Semerikov³

et al. 2022

Preprint

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The use of multilevel information carriers, also known as qudits, is a promising path for exploring scalability of quantum computing devices. In this work, we present a proof-of-principle realization of a quantum processor that uses optically-addressed 171 Yb + ion qudits in a linear trap. The rich level structure of 171 Yb + ions makes it possible to use the Zeeman sublevels of the quadrupole clock transition at 435.5 nm for efficient and robust qudit encoding. We demonstrate the realization of the universal set of gates consisting of single-qudit rotations and two-qudit entangling operation with a two-ququart system, which is formally equivalent to a universal gate-based four-qubit processor. Our results paves a way towards further studies of more efficient implementations of quantum algorithms with trapped-ion-based processors.

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Section: Realizing Of the Qudit Operationscontrasting

confidence: 59%

Section: Trapped-ion Quantum Processor With Optical Quditsmentioning

confidence: 99%

“…The discussion of the state preparation and measurement (SPAM) errors for our system in may be found in Ref. [96].…”

Section: Realizing Of the Qudit Operationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Realizing quantum gates with optically-addressable $^{171}$Yb$^{+}$ ion qudits

Aksenov¹,

V.²,

Semerikov³

et al. 2022

Preprint

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High-precision tomography of ion qubits based on registration of fluorescent photons

Bogdanov¹,

Dmitriev²,

Bantysh³

et al. 2023

Laser Phys. Lett.

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We develop a new method for high-precision tomography of ion qubit registers under conditions of limited distinguishability of logical states. It is not always possible to achieve low error rates during the readout of the quantum states of ion qubits due to the finite lifetime of excited levels, photon scattering, detector dark counts, low numerical aperture, etc. However, the model of fuzzy quantum measurements makes it possible to ensure precise tomography of quantum states. To do this, we developed a fuzzy measurement model based on counting the number of fluorescent photons. A statistically adequate algorithm for the reconstruction of quantum states of ion qubit registers based on fuzzy measurement operators is proposed. The algorithm uses the complete information available in the experiment and makes it possible to account for systematic measurement errors associated with the limited distinguishability of the logical states of ion qubits. We show that the developed model, although computationally more complex, contains significantly more information about the state of the qubit and provides a higher accuracy of state reconstruction compared to the model based on the threshold algorithm.

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