Atomic quantum information processing in low-Q cavity in the intermediate coupling region

Su, Shi‐Lei; Guo, Qi; Zhu, Long; Wang, Hong-Fu; Zhang, Shou

doi:10.1364/josab.29.002827

Cited by 10 publications

(8 citation statements)

References 29 publications

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“…In our scheme, the two different polarizations of the photon are split by the CPBS before the photon interacts with the atom-cavity system, which will reduce the difficulty of the experiment. Our scheme is also different from the work by Su et al [59] in which an atom trapped in an cavity acts as the control qubit and an atom trapped in another cavity acts as the target qubit with an auxiliary atom qubit and measurements on the auxiliary qubit and the photon.…”

Section: Discussionmentioning

confidence: 90%

“…Our scheme is also different from the work by Su et al . 59 in which an atom trapped in an cavity acts as the control qubit and an atom trapped in another cavity acts as the target qubit with an auxiliary atom qubit and measurements on the auxiliary qubit and the photon.…”

Section: Discussionmentioning

confidence: 99%

“…In 2008, Dayan et al [52] achieved an experiment in which the transport of photons is regulated by one atom trapped in a cavity in an intermediate atom-cavity coupling regime with a bad cavity. Without the requirements of good cavities or strict strong coupling strength, many theoretical QIP tasks have been proposed, such as quantum gates [53][54][55][56][57][58][59], generation of entangled states [60], and quantum controlled teleportation [61]. In 2006, Xiao et al [53] proposed a scheme of CPF gate without strict strong coupling on a silicon chip.…”

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confidence: 99%

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Universal quantum gates for photon-atom hybrid systems assisted by bad cavities

Wang

Liu

Wei

et al. 2016

Sci Rep

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We present two deterministic schemes for constructing a CNOT gate and a Toffoli gate on photonatom and photon-atom-atom hybrid quantum systems assisted by bad cavities, respectively. They are achieved by cavity-assisted photon scattering and work in the intermediate coupling region with bad cavities, which relaxes the difficulty of their implementation in experiment. Also, bad cavities are feasible for fast quantum operations and reading out information. Compared with previous works, our schemes do not need any auxiliary qubits and measurements. Moreover, the schematic setups for these gates are simple, especially that for our Toffoli gate as only a quarter wave packet is used to interact the photon with each of the atoms every time. These atom-cavity systems can be used as the quantum nodes in long-distance quantum communication as their relatively long coherence time is suitable for multi-time operations between the photon and the system. Our calculations show that the average fidelities and efficiencies of our two universal hybrid quantum gates are high with current experimental technology.A quantum computer 1 can run the famous Shor's algorithm 2 for integer factorization and implement Grover-Long algorithm 3,4 for unsorted database search. In past decades, it has attracted much attention. Quantum logic gates are the key elements in quantum computers and play a critical role in quantum information processing (QIP). Two-qubit controlled-not (CNOT) gates together with single-qubit gates are sufficient for universal quantum computing 1,5 . In 2004, Shende proposed a "small-circuit" structure which is used to construct CNOT gates 6 . In the domain of three-qubit gates, Toffoli gate has attracted much attention and it is universal. Together with Hadamard gates, it can realize unitary manipulation for a multi-qubit system 7,8 . Moreover, it plays an important role in phase estimation 1 , complex quantum algorithms 2-4 , error correction 9 , and fault tolerant quantum circuits 10 . In 2009, the optimal synthesis for a Toffoli gate with six CNOT gates was proposed 11 . Up to now, for a general three-qubit logic gate, the optimal synthesis requires twenty CNOT gates 12 , which means that this method increases the difficulty and complexity of experiments and the possibility of errors largely. It is significant to seek a simpler scheme to directly implement multi-qubit gates.By far, many physical systems have been used to implement quantum logic gates, such as photons in the polarization degree of freedom (DOF) [13][14][15] and those in both the polarization and the spatial-mode DOFs (the hyper-parallel photonic quantum computing) [16][17][18] , nuclear magnetic resonance [19][20][21][22] , quantum dots 23-27 , diamond nitrogen-vacancy center [28][29][30] , superconduting qubits 31,32 , superconducting resonators (microwave photons) 33,34 , and hybrid quantum systems 35,36 . Cavity quantum electrodynamics (QED) is a promising physical platform for constructing universal quantum logic gates as it can enhance the interac...

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Universal quantum gates for photon-atom hybrid systems assisted by bad cavities

Wang

Liu

Wei

et al. 2016

Sci Rep

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“…Nevertheless, low-Q cavities show important benefits, which is why the bad-cavity limit was thoroughly investigated in recent decades, e.g. for a two-level system [5] and led to several practical applications such as laser cooling of atoms [6], entangling of atoms [7], exploration of quantum Zeno-type effects [8], the enhancement of laser stability [9], the formation of new quasinormal modes [10], and was proposed for quantum memories [11] and quantum-information processing [12][13][14]. Recently, the bad-cavity limit was considered in the context of V-type three-level systems (3LS) and the formation of dark states [15].…”

Section: Introductionmentioning

confidence: 99%

Steady states of Λ-type three-level systems excited by quantum light with various photon statistics in lossy cavities

et al. 2022

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The interaction between quantum light and matter is being intensively studied for systems that are enclosed in high-Q cavities which strongly enhance the light-matter coupling. Cavities with low Q-factors are generally given less attention due to their high losses that quickly destroy quantum systems. However, bad cavities can be utilized for several applications, where lower Q-factors are required, e.g., to increase the spectral width of the cavity mode. In this work, we demonstrate that low-Q cavities can beneficial for preparing specific electronic steady states when certain quantum states of light are applied. We investigate the interaction between quantum light with various statistics and matter represented by a Λ-type three-level system in lossy cavities, assuming that cavity losses are the dominant loss mechanism. We show that cavity losses lead to non-trivial electronic steady states that can be controlled by the loss rate and the initial statistics of the quantum fields. We discuss the mechanism of formation of such steady states on the basis of the equations of motion and present both analytical expressions and numerical simulations for such steady states.

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“…While high-Q cavities are of great interest due to their enhancement of light-matter interaction [1][2][3][4], low-Q cavities are applied when a broader distribution in frequency space is advantageous, e.g., for coupling to the resonances of inhomogeneously broadened systems [5][6][7]. Furthermore, low-Q cavities are of interest for quantum-information processing [8][9][10] and recently attract more attention due to the formation of new quasinormal modes [11].…”

Section: Introductionmentioning

confidence: 99%

Steady states of $Λ$-type three-level systems excited by quantum light in lossy cavities

Rose,

Tikhonova,

Meier

et al. 2021

Preprint

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The interaction between quantum light and matter is being intensively studied for systems that are enclosed in high-Q cavities which strongly enhance the light-matter coupling. However, for many applications, cavities with lower Q-factors are preferred due to the increased spectral width of the cavity mode. Here, we investigate the interaction between quantum light and matter represented by a Λ-type three-level system in lossy cavities, assuming that cavity losses are the dominant loss mechanism. We demonstrate that cavity losses lead to non-trivial steady states of the electronic occupations that can be controlled by the loss rate and the initial statistics of the quantum fields. The mechanism of formation of such steady states can be understood on the basis of the equations of motion. Analytical expressions for steady states and their numerical simulations are presented and discussed.

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Atomic quantum information processing in low-Q cavity in the intermediate coupling region

Cited by 10 publications

References 29 publications

Universal quantum gates for photon-atom hybrid systems assisted by bad cavities

Universal quantum gates for photon-atom hybrid systems assisted by bad cavities

Steady states of Λ-type three-level systems excited by quantum light with various photon statistics in lossy cavities

Steady states of $Λ$-type three-level systems excited by quantum light in lossy cavities

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