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Physical Review A

Quantum computation without strict strong coupling on a silicon chip

Yun‐Feng Xiao, Zheng‐Fu Han, Guang‐Can Guo

Published May 31, 2006• 32 citations
Publisher

Abstract

We propose a potential quantum-computer hardware-architecture model on a silicon chip in which the basic cell gate is the atom-photon controlled-phase-flip gate. This gate can be implemented through a single-photon pulse's scattering by a toroidal microcavity trapping a neutral atom, and it does not require very strict strong-coupling regime and can work beyond the Lamb-Dicke limit with high fidelity and success probability under practical noise environments. Especially, good and bad losses of the toroidal cavity are discussed in detail. Finally, a possibly simple experiment based on current experimental technology is proposed to demonstrate our scheme.

DOI
10.1103/physreva.73.052324

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We propose a potential quantum-computer hardware-architecture model on a silicon chip in which the basic cell gate is the atom-photon controlled-phase-flip gate. This gate can be implemented through a single-photon pulse's scattering by a toroidal microcavity trapping a neutral atom, and it does not require very strict strong-coupling regime and can work beyond the Lamb-Dicke limit with high fidelity and success probability under practical noise environments. Especially, good and bad losses of the toroidal cavity are discussed in detail. Finally, a possibly simple experiment based on current experimental technology is proposed to demonstrate our scheme.
We propose a scheme to achieve quantum computation with neutral atoms whose interactions are catalyzed by single photons. Conditional quantum gates, including an NNN-atom Toffoli gate and nonlocal gates on remote atoms, are obtained through cavity-assisted photon scattering in a manner that is robust to random variation in the atom-photon coupling rate and which does not require localization in the Lamb-Dicke regime. The dominant noise in our scheme is automatically detected for each gate operation, leading to signalled errors which do not preclude efficient quantum computation even if the error probability is close to the unity.
We propose a scheme to implement quantum controlled SWAP gates by directing single-photon pulses to a two-sided cavity with a single trapped atom. The resultant gates can be used to realize quantum fingerprinting and universal photonic quantum computation. We present a theoretical model for our scheme and analyze its performance under practical noise, including spontaneous emission and randomness of atom-cavity coupling strength. It is shown that our scheme should be robust against practical imperfections in current cavity QED experiment setup.
We propose a scheme to achieve a parallelized controlled-NOT (c-not) gate based on electromagnetically induced transparency (EIT) and cavity-assisted photon scattering. By using the flying photon as the control bit, we can implement a conditional transfer between two logical states of an atom trapped in the cavity with high fidelity and on a microsecond time scale. Thanks to the fact that the photon is well suited for scalable quantum computation, a quantum c-not gate between the single-photon pulses and the nonlocal gate on remote atoms are obtained by reflecting the photon pulse from an optical cavity with a single-trapped atom. Our protocol is robust for spontaneous emission and works quite well in the bad-cavity limit, which makes it more applicable in the laboratory with current experimental techniques.
Quantum gates are the building blocks of quantum circuits, which in turn are the cornerstones of quantum information processing. In this work, we theoretically investigate a single-step implementation of both a universal two- (cnot) and three-qubit (quantum Fredkin) gates in a cross-cavity setup coupled to a $\mathrm{\ensuremath{\Lambda}}$-type three-level atom. Within a high-cooperativity regime, the system exhibits an atomic-state-dependent $\ensuremath{\pi}$-phase gate involving the two-mode single-photon bright and dark states of the input light pulses. This allows for the controlled manipulation of light states by the atom and vice versa. Our results indicate these quantum gates can be implemented with high probability of success using the state-of-the-art parameters, either for the weak- or strong-coupling regime, where the quantum interference is due to an electromagnetically induced transparencylike phenomenon and the Autler-Townes splitting, respectively. This work not only paves the way for implementing quantum gates in a single step using simple resources, thus avoiding the need to chain basic gates together in a circuit, but it also endorses the potential of cross-cavity systems for realizing universal quantum computation.
Parity-check building blocks are useful in quantum algorithms, quantum communications, and quantum computing, and such devices may be helpful in implementing robust universal quantum gates. We propose a scheme to construct a robust deterministic controlled-not gate on static electron-spin qubits with parity-check building blocks, assisted by double-sided-cavity quantum systems. Our device is robust against the polarization-flip errors, and it can work in both the weak coupling and strong coupling regimes, but high fidelity is achieved only when the ratio of the side leakage to the cavity loss is low. Our gate is heralded by the polarization of the single-photon medium. Finally, we assess the feasibility of this device and show it can be implemented with current technology.