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Controlled-NOT gate sequences for mixed spin qubit architectures in a noisy environment

quantum INFORMATION PROCESSING 2017年第11期16卷 1-21页

作者： Ferraro, E. Fanciulli, M. De Michielis, M. CNR IMM Agrate Unit Via Olivetti 2 I-20864 Agrate Brianza MB Italy Univ Milano Bicocca Dipartimento Sci Mat Via R Cozzi 55 I-20125 Milan Italy

Explicit controlled-NOT gate sequences between two qubits of different types are presented in view of applications for large-scale quantum computation. Here, the building blocks for such composite systems are qubits based on the electrostatically confined electronic spin in semiconductor quantum dots. For each system the effective Hamiltonian models expressed by only exchange interactions between pair of electrons are exploited in two different geometrical configurations. A numerical genetic algorithm that takes into account the realistic physical parameters involved is adopted. Gate operations are addressed by modulating the tunneling barriers and the energy offsets between different couple of quantum dots. Gate infidelities are calculated considering limitations due to unideal control of gate sequence pulses, hyperfine interaction and charge noise.

关键词： quantum computation architectures and implementations quantum dots Noise quantum gate sequences

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Realization of universal nonadiabatic geometric control on decoherence-free qubits in the XY model

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EPL 2018年第2期121卷 20004-20004页

作者： Mousolou, Vahid Azimi Univ Isfahan Dept Math Fac Sci Box 81745-163 Esfahan Iran Inst Res Fundamental Sci IPM Sch Math POB 19395-5746 Tehran Iran

A fundamental requirement of quantum information processing is the protection from the adverse effects of decoherence and noise. Decoherence-free subspaces and geometric processing are important steps of quantum information protection. Here, we provide a new experimentally feasible scheme to combine decoherence-free subspaces with nonadiabatic geometric manipulations to attain a universal quantum computation. The proposed scheme is different from previous proposals and is based on the typical XY interaction coupling, which can be set up in various nano-engineered systems and therefore open up for realization of nonadiabatic holonomic quantum computation in decoherence-free subspaces. Copyright (C) EPLA, 2018

关键词： quantum error correction and other methods for protection against decoherence Phases: geometric, dynamic or topological quantum computation architectures and implementations

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Single-loop realization of universal nonadiabatic holonomic gates in decoherence-free subspaces

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EPL 2018年第4期124卷 40003-40003页

作者： Wang, Chang Guo, Zhenping Yanbian Univ Dept Phys Yanji 133002 Peoples R China

Control errors and decoherence are two main obstacles for realization of quantum computation. Nonadiabatic holonomic quantum computation in decoherence-free subspaces can protect quantum gates from both control errors and decoherence, and, therefore, it has received increasing attention. The original protocol of nonadiabatic holonomic quantum computation in decoherence-free subspaces needs two loops in the Grassmann manifold to generate an arbitrary nonadiabatic holonomic one-qubit gate. In this paper, we proposed a protocol of nonadiabatic holonomic quantum computation in decoherence-free subspaces, where an arbitrary one-qubit gate is generated by only a single loop in the Grassmann manifold and an entangling two-qubit gate assisted by two single-qubit gates can be used to construct a two-qubit controlled unitary gate. In addition, the encoding of our protocol for nonadiabatic holonomic gates requires a lower number of physical qubits compared with previous schemes. Our scheme not only maintains the merits of the original protocol but it also avoids the extra work of combining two gates to realize an arbitrary one-qubit gate. Copyright (C) EPLA, 2018

关键词： quantum computation architectures and implementations quantum error correction and other methods for protection against decoherence Phases: geometric, dynamic or topological

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Spin-Rayleigh wave interaction in CVD diamond films

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EPL 2018年第1期124卷 10003-10003页

作者： Hebbache, M. Univ Paris 07 Sorbonne Paris Cite MPQ CNRSUMR 7162 F-75205 Paris France

It has been suggested that surface acoustic waves can couple remote quantum bits (qubits). Bulk diamond and chemical vapor deposition diamond films host the negatively charged nitrogen-vacancy color center (NV-1) which carry an electronic spin-1. The latter is among the most promising qubits for implementing scalable quantum information processing. The characteristic features of the Rayleigh surface acoustic wave which can propagate near the free surface of a diamond thin film are investigated. The texture of the film is taken into account. A phenomenological theory of the spin-phonon interaction is applied to describe the coupling between the Rayleigh surface acoustic wave and the NV-1 spin-qubits. Copyright (C) EPLA, 2018

关键词： quantum mechanics quantum computation architectures and implementations Ultrasonics, quantum acoustics, and physical effects of sound

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Experimental simulation of solution to boson sampling based on classical electronic circuits with exponential frequency bandwidth

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EPL 2018年第5期123卷 50003-50003页

作者： Yang, Z. W. Bao, J. C. Sun, H. J. Zhang, X. D. Beijing Inst Technol Beijing Key Lab Nanophoton & Ultrafine Optoelect Sch Phys Beijing 100081 Peoples R China Beijing Inst Technol Sch Informat & Elect Beijing 100081 Peoples R China

A Boson sampling device is believed to be a specific quantum computer which is more efficient than its classical counterpart. Recently, a number of experimental realizations have been reported, all were based on multi-photon interference in multimode interferometers. Because of the probabilistic nature of single photons, the technique of coincidence counting has to be used in these schemes, it remains a great challenge to scale up the number of photons. Here, we present a novel way to simulate the solution of the boson sampling problem based on classical electronic circuits. Although an exponential frequency bandwidth is used, thus limiting the scalability of the scheme, the running time of our scheme is equivalent to those based on quantum optics. It is also notable that our method has good stability of classical circuits. In addition, some other related problems, which are computationally hard for classical computers, can also be simulated using our scheme. Thus, our findings are advantageous for information processing in the era of big data. Copyright (C) EPLA, 2018

关键词： quantum algorithms, protocols, and simulations quantum computation architectures and implementations

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quantum Cryptography Based on the Deutsch-Jozsa Algorithm

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INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS 2017年第9期56卷 2887-2897页

作者： Nagata, Koji Nakamura, Tadao Farouk, Ahmed Korea Adv Inst Sci & Technol Dept Phys Daejeon South Korea Keio Univ Dept Informat & Comp Sci Kohoku Ku 3-14-1 Hiyoshi Yokohama Kanagawa Japan Mansoura Univ Fac Comp & Informat Dept Comp Sci Mansoura Egypt Univ Sci & Technol Zewail City Sci & Technol Giza Egypt Sci Res Grp Cairo Egypt

Recently, secure quantum key distribution based on Deutsch's algorithm using the Bell state is reported (Nagata and Nakamura, Int. J. Theor. Phys. doi:10.1007/s10773-017-3352-4, 2017). Our aim is of extending the result to a multipartite system. In this paper, we propose a highly speedy key distribution protocol. We present sequre quantum key distribution based on a special Deutsch-Jozsa algorithm using Greenberger-Horne-Zeilinger states. Bob has promised to use a function f which is of one of two kinds;either the value of f(x) is constant for all values of x, or else the value of f(x) is balanced, that is, equal to 1 for exactly half of the possible x, and 0 for the other half. Here, we introduce an additional condition to the function when it is balanced. Our quantum key distribution overcomes a classical counterpart by a factor O(2 (N) ).

关键词： quantum computation architectures and implementations quantum algorithms, protocols, and simulations quantum cryptography

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quantum communication protocols by quantum walks with two coins

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EPL 2018年第6期124卷 60009-60009页

作者： Shang, Yun Wang, Yu Li, Meng Lu, Ruqian Chinese Acad Sci Acad Math & Syst Sci Inst Math Beijing 100190 Peoples R China Chinese Acad Sci Acad Math & Syst Sci MDIS NCMIS Beijing 100190 Peoples R China Univ Chinese Acad Sci Sch Math Sci Beijing 100049 Peoples R China Chinese Acad Sci Inst Comp Technol Key Lab IIP Beijing 100190 Peoples R China

We introduce some new perfect state transfer and generalized long-distance teleportation schemes by quantum walks with two coins. By encoding the transferred information in the coin-1 state and alternately using two coin operators, we can perfectly recover the information in the coin-1 state at the target position by at most two flipping operations. On the basis of quantum walks with two coins on either a line or an N-circle, we can perfectly transfer any qubit state. In addition, using quantum walks with two coins on regular graphs, we can first implement a perfect qudit state transfer by quantum walks. Compared with existing schemes driven by one coin, more general graph structures can be used to perfectly transfer a more general state. We also study how to realize generalized teleportation over long-distance walks by the above quantum walk models. Copyright (C) EPLA, 2019

关键词： quantum algorithms, protocols, and simulations quantum computation architectures and implementations quantum communication

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Universal non-adiabatic geometric manipulation of pseudo-spin charge qubits

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EPL 2017年第1期117卷 10006-10006页

作者： Mousolou, Vahid Azimi Univ Isfahan Fac Sci Dept Math POB 81745-163 Esfahan Iran

Reliable quantum information processing requires high-fidelity universal manipulation of quantum systems within the characteristic coherence times. Non-adiabatic holonomic quantum computation offers a promising approach to implement fast, universal, and robust quantum logic gates particularly useful in nano-fabricated solid-state architectures, which typically have short coherence times. Here, we propose an experimentally feasible scheme to realize high-speed universal geometric quantum gates in nano-engineered pseudo-spin charge qubits. We use a system of three coupled quantum dots containing a single electron, where two computational states of a double quantum dot charge qubit interact through an intermediate quantum dot. The additional degree of freedom introduced into the qubit makes it possible to create a geometric model system, which allows robust and efficient single-qubit rotations through careful control of the inter-dot tunneling parameters. We demonstrate that a capacitive coupling between two charge qubits permits a family of non-adiabatic holonomic controlled two-qubit entangling gates, and thus provides a promising procedure to maintain entanglement in charge qubits and a pathway toward fault-tolerant universal quantum computation. We estimate the feasibility of the proposed structure by analyzing the gate fidelities to some extent. Copyright (C) EPLA, 2017

关键词： quantum computation architectures and implementations Phases: geometric, dynamic or topological Single electron devices

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Experimentally freezing quantum discord in a dephasing environment using dynamical decoupling

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EPL 2017年第5期118卷 50001-50001页

作者： Harpreet Singh, Arvind Dorai, Kavita Indian Inst Sci Educ & Res IISER Mohali Dept Phys Sci Sect 81 SAS NagarPO 140306 Manauli Punjab India

The discovery of the intriguing phenomenon that certain kinds of quantum correlations remain impervious to noise up to a specific point in time and then suddenly decay, has generated immense recent interest. We exploit dynamical decoupling sequences to prolong the persistence of time-invariant quantum correlations in a system of two NMR qubits decohering in independent dephasing environments. We experimentally prepare two-qubit Bell-diagonal quantum states that interact with individual noise channels and demonstrate that we are able to freeze quantum correlations over long time scales via dynamical decoupling. Our results have important implications for experimental quantum control and for quantum information processing protocols. Copyright (C) EPLA, 2017.

关键词： quantum information quantum error correction and other methods for protection against decoherence quantum computation architectures and implementations

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Selective addressing and readout of optically detected electron spins

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EPL 2017年第1期117卷 10001-10001页

作者： Zgadzai, Oleg Shtirberg, Lazar Artzi, Yaron Blank, Aharon Technion Israel Inst Technol Schulich Fac Chem IL-32000 Haifa Israel

Optically detected magnetic resonance (ODMR) is known to allow the ultrasensitive detection of a small number of electron spins for species such as nitrogen vacancy (NV) centers in diamond, down to the single spin level. This method was recently combined with the pulsed magnetic resonance imaging (MRI) technique known as optically detected magnetic resonance imaging (ODMRI) to obtain images of NVs at resolutions ranging from the micron- to the nanoscale. The great advantage of ODMRI is that the quantum state of the spins can be acquired (i.e., readout) in parallel from all parts of the sample without any loss of spectroscopic information. Here we further enhance the utility of our ODMRI technique by improving its spatial resolution and adding a spatially selective spin addressing and manipulation capability. We demonstrate this capability by selectively manipulating a specific group of spins in our sample and subsequently imaging the entire sample to show this selectivity effect. Such capabilities are of fundamental importance in the field of spin-based quantum devices and sensors. Copyright (C) EPLA, 2017

关键词： quantum computation architectures and implementations NMR imaging Electron paramagnetic resonance and relaxation

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