Generating entangled states from coherent states in circuit QED

Qi, Shi-fan; Jing, Jun

doi:10.1103/physreva.107.042412

Cited by 5 publications

(2 citation statements)

References 63 publications

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“…In recent years, there is a growing field of research in utilizing high-dimensional quantum systems for quantum information processing [1][2][3][4][5]. Among them, the three-level system has become a representative and popular candidate for encoding qubit [6][7][8][9][10][11][12][13][14], since temporarily using a third state [15][16][17] can reduce the number of physical entities [18] and improve the fidelity of quantum computations [19][20][21][22][23]. This system allows quantum information to be encoded into two low-energy levels, with the transition being indirectly realized through a high-energy one.…”

Section: Introductionmentioning

confidence: 99%

High-fidelity quantum gates via optimizing short pulse sequences in three-level systems

Zhang,

Liu,

Song

et al. 2024

New J. Phys.

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We propose a robust and high-fidelity scheme for realizing universal quantum gates by optimizing short pulse sequences in a three-level system. To alleviate the sensitivity to the errors, we recombine all elements of error matrices to construct a cost function with three types of weight factors. The modulation parameters are obtained by searching for the minimum value of this cost function. The purposes of introducing the weight factors are to reduce the detrimental impact of high-order error matrices, suppress population leakage to the third state, correct the operational error in the qubit space, and optimize the total pulse area of short pulse sequences. The results demonstrate that the optimized sequences exhibit strong robustness against errors and effectively reduce the total pulse area. Therefore, this work presents a valuable method for achieving exceptional robustness and high speed in quantum computations.

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Section: Introductionmentioning

confidence: 99%

High-fidelity quantum gates via optimizing short pulse sequences in three-level systems

Zhang,

Liu,

Song

et al. 2024

New J. Phys.

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“…There has been a variety of recent proposals to manufacture NOON states that include the use of trapped ions [16], waveguide arrays [17], ultracold bosons [18][19][20], double-slit interference [21], magnons [22], cavity quantum electrodynamics (QED) [23], and circuit QED [24]. One proposal for massive NOON state generation uses a system of dipolar atoms confined to a four-site lattice [25,26].…”

Section: Introductionmentioning

confidence: 99%

NOON state measurement probabilities and outcome fidelities: a Bethe ansatz approach

Bennett,

Isaac,

Links

2023

J. Phys. A: Math. Theor.

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A recently proposed extended Bose–Hubbard model, one that is a quantum integrable model, provides a framework for a NOON state generation protocol. Here we derive a Bethe ansatz solution for the model. The form of the solution provides the means to obtain exact asymptotic expressions for the energies and eigenstates. These results are used to derive formulae for measurement probabilities and outcome fidelities. We benchmark these results against numerical calculations.

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Topologically Protected Synthesizing of Fock States in a Circuit Quantum Electrodynamics Architecture

Xin,

Yu,

Zhou

et al. 2024

Physica Rapid Research Ltrs

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The preparation of Fock states is important for quantum information storage and processing. Here we present a two‐step protocol with topological protection for multi‐photon Fock states synthesizing in a circuit QED architecture. Due to photon number‐dependent vacuum Rabi splitting, the dynamics of the Jaynes‐Cummings ladder in the resonant regime can be equivalent to a spin‐1/2 chain while a multi‐frequency microwave pulse is applied. Based on the topologically assisted quantum state transfer technique, multi‐photon Fock states can be conditionally generated. Our method significantly reduces the complexity of experimental manipulation compared with previous multi‐step methods and is more robust as a result of topological protection. Furthermore, the protocol indicates that the circuit QED architecture could potentially provide a platform to explore the exotic phase in condensed matter.This article is protected by copyright. All rights reserved.

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Generating entangled states from coherent states in circuit QED

Cited by 5 publications

References 63 publications

High-fidelity quantum gates via optimizing short pulse sequences in three-level systems

High-fidelity quantum gates via optimizing short pulse sequences in three-level systems

NOON state measurement probabilities and outcome fidelities: a Bethe ansatz approach

Topologically Protected Synthesizing of Fock States in a Circuit Quantum Electrodynamics Architecture

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