Rare earth ions doped mixed crystals for fast quantum computers with optical frequency qubits

Hizhnyakov, V.; Boltrushko, V.; Kaasik, Helle; Orlovskii, Yu.V.

doi:10.1016/j.optcom.2020.126693

Cited by 17 publications

(5 citation statements)

References 53 publications

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“…[ 7–19 ] It is of interest for near‐infrared (NIR) PL in quantum cutting, optical fiber communication, and quantum computing. [ 20–25 ] However, the investigation on the NIR PL of lead‐free perovskite NCs are rare. Generally, there are two strategies to achieve the NIR emission.…”

Section: Introductionmentioning

confidence: 99%

All‐Inorganic Rare‐Earth‐Based Double Perovskite Nanocrystals with Near‐Infrared Emission

Han

Zheng

et al. 2021

Laser & Photonics Reviews

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Lead‐free halide perovskite nanocrystals (NCs) with the unique optical properties are of interest for broad applications. There are a few studies on near‐infrared (NIR) emission in perovskite NCs. Here, all‐inorganic rare‐earth‐based Cs2NaEr1−xBxCl6 (B: In, Sb, or Bi; x = 0, 0.13, and 0.5) double perovskite (DP) NCs have been successfully sythesized. The Cs2NaErCl6 NCs show good air stability and emit a sharp NIR photoluminescence (PL) at telecommunication wavelength of 1543 nm, originating from 4I13/2→4I15/2 transition of the Er3+, and its average lifetime is 35.7 µs. Especially for Cs2NaEr0.5Sb0.5Cl6 NCs, NIR PL can be enhanced 23‐fold with the lifetime being 119.1 µs. Moreover, femtosecond transient absorption measurements prove that a long‐lifetime trap state promotes NIR emitting in the mixed Sb/Er DP NCs.

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Section: Introductionmentioning

confidence: 99%

All‐Inorganic Rare‐Earth‐Based Double Perovskite Nanocrystals with Near‐Infrared Emission

Han

Zheng

et al. 2021

Laser & Photonics Reviews

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“…The rareearth platform is versatile and has shown promise in fields related to quantum computing, such as quantum memories [7][8][9][10][11][12][13][14][15][16][17][18], conversion between optical and microwave signals [19][20][21], and single photon sources [22]. Much work has also been devoted to quantum computing [23][24][25][26][27][28][29][30][31][32][33], which is the topic that here is investigated through simulations. Since the topic is rather complex, we start by providing a general overview of the system.…”

Section: Introductionmentioning

confidence: 99%

Designing gate operations for single ion quantum computing in rare-earth-ion-doped crystals

Kinos,

Rippe,

Kröll

et al. 2021

Preprint

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Quantum computers based on rare-earth-ion-doped crystals show promising properties in terms of scalability and connectivity if single ions can be used as qubits. Through simulations, we investigate gate operations on such qubits and discuss how gate and system parameters affect gate errors, the required frequency bandwidth per qubit, and the risk of instantaneous spectral diffusion (ISD) occurring. Furthermore, we examine how uncertainties in the system parameters affect the gate errors, and how precisely the system needs to be known. We find gate errors for arbitrary singlequbit gates of 2.1 • 10 −4 when ISD is not considered and 3.4 • 10 −4 when we take heed to minimize it. Additionally, we construct two-qubit gates with errors ranging from 5 • 10 −4 → 3 • 10 −3 over a broad range of dipole-dipole interaction strengths.

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“…Rare-earth-ion-doped crystals are versatile materials that have been used in, e.g., quantum memories [1][2][3][4][5][6][7][8][9][10][11][12], conversion between optical and microwave signals [13][14][15], and quantum computing [16][17][18][19][20][21][22][23][24][25][26][27]. This has in large part been thanks to their long life- [28] and coherence times [29][30][31], and their capacity to store large amounts of information.…”

Section: Introductionmentioning

confidence: 99%

Microscopic treatment of instantaneous spectral diffusion and its effect on quantum gate fidelities in rare-earth-ion-doped crystals

Kinos,

Rippe,

Walther

et al. 2021

Preprint

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The effect of instantaneous spectral diffusion (ISD) on gate operations in rare-earth-ion-doped crystals is an important question to answer for the future of rare-earth quantum computing. ISD has previously been extensively studied for ensemble systems, where it is observed as a dephasing that depends on the degree of excitation. However, for applications that use single ions, a microscopic modeling that highlights the stochastic nature of the ISD phenomena is necessary. Here we present such a model and use it to investigate ISD errors on single-qubit gate operations. However, directly simulating how the qubit is affected by all non-qubit ions is intractable since the size of the system grows exponentially with the number of ions. To circumvent this problem, we present a method to estimate the error of the full system by examining smaller subsystems, each evaluating the rotation and shrinkage of the qubit Bloch vector due to only one error source. In the case of ISD, the different error sources are individual ions causing ISD, but the method is general and thus applicable to other systems as long as the errors are largely independent. After studying ISD due to the ions surrounding a qubit, we conclude that transmission windows (prepared by optical pumping) are necessary to suppress the ISD errors. Despite using such windows, there remains a roughly 0.3% risk that a qubit has an ISD error larger than the error from other sources. However, in those cases the qubit can be discarded and its frequency channel can be reused by another qubit. In most cases the ISD errors are significantly smaller than other errors, thus opening up the possibility to perform noisy intermediate-scale quantum (NISQ) algorithms despite ISD being present. Finally, the approach presented here creates a foundation that can be used to study how ISD affects even more complicated gate operations.

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Rare earth ions doped mixed crystals for fast quantum computers with optical frequency qubits

Cited by 17 publications

References 53 publications

All‐Inorganic Rare‐Earth‐Based Double Perovskite Nanocrystals with Near‐Infrared Emission

All‐Inorganic Rare‐Earth‐Based Double Perovskite Nanocrystals with Near‐Infrared Emission

Designing gate operations for single ion quantum computing in rare-earth-ion-doped crystals

Microscopic treatment of instantaneous spectral diffusion and its effect on quantum gate fidelities in rare-earth-ion-doped crystals

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