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J R Petta - One of the best experts on this subject based on the ideXlab platform.

  • fast room temperature Phase Gate on a single nuclear spin in diamond
    Physical Review Letters, 2014
    Co-Authors: Sorawis Sangtawesin, T. O. Brundage, J R Petta
    Abstract:

    : Nuclear spins support long lived quantum coherence due to weak coupling to the environment, but are difficult to rapidly control using nuclear magnetic resonance as a result of the small nuclear magnetic moment. We demonstrate a fast ∼500  ns nuclear spin Phase Gate on a (14)N nuclear spin qubit intrinsic to a nitrogen-vacancy center in diamond. The Phase Gate is enabled by the hyperfine interaction and off-resonance driving of electron spin transitions. Repeated applications of the Phase Gate bang-bang decouple the nuclear spin from the environment, locking the spin state for up to ∼140  μs.

  • Fast room-temperature Phase Gate on a single nuclear spin in diamond
    Physical Review Letters, 2014
    Co-Authors: Sorawis Sangtawesin, T. O. Brundage, J R Petta
    Abstract:

    Nuclear spins support long lived quantum coherence due to weak coupling to the environment, but are difficult to rapidly control using nuclear magnetic resonance (NMR) as a result of the small nuclear magnetic moment. We demonstrate a fast ~ 500 ns nuclear spin Phase Gate on a 14N nuclear spin qubit intrinsic to a nitrogen-vacancy (NV) center in diamond. The Phase Gate is enabled by the hyperfine interaction and off-resonance driving of electron spin transitions. Repeated applications of the Phase Gate bang-bang decouple the nuclear spin from the environment, locking the spin state for up to ~ 140 microseconds.

Sorawis Sangtawesin - One of the best experts on this subject based on the ideXlab platform.

  • fast room temperature Phase Gate on a single nuclear spin in diamond
    Physical Review Letters, 2014
    Co-Authors: Sorawis Sangtawesin, T. O. Brundage, J R Petta
    Abstract:

    : Nuclear spins support long lived quantum coherence due to weak coupling to the environment, but are difficult to rapidly control using nuclear magnetic resonance as a result of the small nuclear magnetic moment. We demonstrate a fast ∼500  ns nuclear spin Phase Gate on a (14)N nuclear spin qubit intrinsic to a nitrogen-vacancy center in diamond. The Phase Gate is enabled by the hyperfine interaction and off-resonance driving of electron spin transitions. Repeated applications of the Phase Gate bang-bang decouple the nuclear spin from the environment, locking the spin state for up to ∼140  μs.

  • Fast room-temperature Phase Gate on a single nuclear spin in diamond
    Physical Review Letters, 2014
    Co-Authors: Sorawis Sangtawesin, T. O. Brundage, J R Petta
    Abstract:

    Nuclear spins support long lived quantum coherence due to weak coupling to the environment, but are difficult to rapidly control using nuclear magnetic resonance (NMR) as a result of the small nuclear magnetic moment. We demonstrate a fast ~ 500 ns nuclear spin Phase Gate on a 14N nuclear spin qubit intrinsic to a nitrogen-vacancy (NV) center in diamond. The Phase Gate is enabled by the hyperfine interaction and off-resonance driving of electron spin transitions. Repeated applications of the Phase Gate bang-bang decouple the nuclear spin from the environment, locking the spin state for up to ~ 140 microseconds.

Shou Zhang - One of the best experts on this subject based on the ideXlab platform.

  • shortcuts to adiabatic passage for multiqubit controlled Phase Gate
    Physical Review A, 2015
    Co-Authors: Yan Liang, Shou Zhang, Qicheng Wu, Shilei Su, Xin Ji
    Abstract:

    We propose an alternative scheme of shortcuts to a quantum controlled Phase Gate in a much shorter time based on the approach of Lewis-Riesenfeld invariants in cavity quantum electrodynamics systems. This scheme can be used to perform a one-qubit Phase Gate, a two-qubit controlled Phase Gate, as well as a multiqubit controlled Phase Gate. The strict numerical simulations demonstrate that the total operation time for implementing controlled Phase Gates is much shorter than previous schemes and very robust against decoherence.

  • optically controlled Phase Gate and teleportation of a controlled not Gate for spin qubits in a quantum dot microcavity coupled system
    Physical Review A, 2013
    Co-Authors: Hong-fu Wang, Shou Zhang, Kyu-hwang Yeon
    Abstract:

    Assisted with linear optical manipulation, single photon, entangled photon pairs, photon measurement, and classical communication, a scheme for two-spin qubits Phase Gate and teleportation of a CNOT Gate between two electron spins from acting on local qubits to acting on remote qubits using quantum dots in optical microcavities is proposed. The scheme is based on spin selective photon reflection from the cavity and is achieved in a deterministic way by the sequential detection of photons and the single-qubit rotations of a single electron spin in a self-assembled GaAs/InAs quantum dot. The feasibility of the scheme is assessed showing that high average fidelities of the Gates are achievable in the weak-coupling regime when the side leakage and cavity loss are low. The scheme opens promising perspectives for long-distance quantum communication, distributed quantum computation, and constructing remote quantum information processing networks.

  • Three-qubit Phase Gate on three modes of a cavity
    Optics Communications, 2009
    Co-Authors: Xiao-qiang Shao, Shou Zhang, Hong-fu Wang, Li Chen, Yong-fang Zhao, Kyu-hwang Yeon
    Abstract:

    Abstract We show that a three-qubit Phase Gate on three modes of a cavity can be realized via resonant atom–cavity interaction. By introducing two strong classical fields and modulating the amplitudes, we obtain the effective form of nonlinear interaction between photons in the three-mode cavity. The availability is testified via numerical analysis. We also consider both the situations with and without effect of decoherence.

  • Creating unconventional geometric Phase Gate using squeeze-like operator assisted by strong driving field
    Chinese Physics, 2007
    Co-Authors: Ai-dong Zhu, Shou Zhang, Kyu-hwang Yeon, Seong-cho Yu, Chung-in Um
    Abstract:

    Based on the idea that a squeezing process can be thought of as a total cumulative effect of a large number of tiny squeezing processes, we define a squeeze-like operator with a time-dependent squeeze parameter. Applying this operator to and combining with a system which includes a two-photon interaction between two atoms and an initial vacuum cavity field, and resorting to a resonant strong driving classical field, we obtain an unconventional geometric Phase Gate with a shorter gating time. © 2007 Chin. Phys. Soc. and IOP Publishing Ltd.

T. O. Brundage - One of the best experts on this subject based on the ideXlab platform.

  • fast room temperature Phase Gate on a single nuclear spin in diamond
    Physical Review Letters, 2014
    Co-Authors: Sorawis Sangtawesin, T. O. Brundage, J R Petta
    Abstract:

    : Nuclear spins support long lived quantum coherence due to weak coupling to the environment, but are difficult to rapidly control using nuclear magnetic resonance as a result of the small nuclear magnetic moment. We demonstrate a fast ∼500  ns nuclear spin Phase Gate on a (14)N nuclear spin qubit intrinsic to a nitrogen-vacancy center in diamond. The Phase Gate is enabled by the hyperfine interaction and off-resonance driving of electron spin transitions. Repeated applications of the Phase Gate bang-bang decouple the nuclear spin from the environment, locking the spin state for up to ∼140  μs.

  • Fast room-temperature Phase Gate on a single nuclear spin in diamond
    Physical Review Letters, 2014
    Co-Authors: Sorawis Sangtawesin, T. O. Brundage, J R Petta
    Abstract:

    Nuclear spins support long lived quantum coherence due to weak coupling to the environment, but are difficult to rapidly control using nuclear magnetic resonance (NMR) as a result of the small nuclear magnetic moment. We demonstrate a fast ~ 500 ns nuclear spin Phase Gate on a 14N nuclear spin qubit intrinsic to a nitrogen-vacancy (NV) center in diamond. The Phase Gate is enabled by the hyperfine interaction and off-resonance driving of electron spin transitions. Repeated applications of the Phase Gate bang-bang decouple the nuclear spin from the environment, locking the spin state for up to ~ 140 microseconds.

Chui-ping Yang - One of the best experts on this subject based on the ideXlab platform.

  • Multiplex-controlled Phase Gate with qubits distributed in a multicavity system
    Physical Review A, 2018
    Co-Authors: Biaoliang Ye, Zhen-fei Zheng, Chui-ping Yang
    Abstract:

    We present a way to realize a multiplex-controlled Phase Gate of n-1 control qubits simultaneously controlling one target qubit, with n qubits distributed in n different cavities. This multiqubit Gate is implemented by using n qutrits (three-level natural or artificial atoms) placed in n different cavities, which are coupled to an auxiliary qutrit. Here, the two logic states of a qubit are represented by the two lowest levels of a qutrit placed in a cavity. We show that this n-qubit controlled Phase Gate can be realized using only 2n+2 basic operations, i.e., the number of required basic operations only increases linearly with the number n of qubits. Since each basic operation employs the qutrit-cavity or qutrit-pulse resonant interaction, the Gate can be fast implemented when the number of qubits is not large. Numerical simulations show that a three-qubit controlled Phase Gate, which is executed on three qubits distributed in three different cavities, can be high-fidelity implemented by using a circuit QED system. This proposal is quite general and can be applied to a wide range of physical systems, with atoms, NV centers, quantum dots, or various superconducting qutrits distributed in different cavities. Finally, this method can be applied to implement a multiqubit controlled Phase Gate with atoms using a cavity. A detailed discussion on implementing a three-qubit controlled Phase Gate with atoms and one cavity is presented.

  • Multi-target-qubit unconventional geometric Phase Gate in a multi-cavity system
    Scientific Reports, 2016
    Co-Authors: Qi-ping Su, Shao-jie Xiong, Chui-ping Yang
    Abstract:

    : Cavity-based large scale quantum information processing (QIP) may involve multiple cavities and require performing various quantum logic operations on qubits distributed in different cavities. Geometric-Phase-based quantum computing has drawn much attention recently, which offers advantages against inaccuracies and local fluctuations. In addition, multiqubit Gates are particularly appealing and play important roles in QIP. We here present a simple and efficient scheme for realizing a multi-target-qubit unconventional geometric Phase Gate in a multi-cavity system. This multiqubit Phase Gate has a common control qubit but different target qubits distributed in different cavities, which can be achieved using a single-step operation. The Gate operation time is independent of the number of qubits and only two levels for each qubit are needed. This multiqubit Gate is generic, e.g., by performing single-qubit operations, it can be converted into two types of significant multi-target-qubit Phase Gates useful in QIP. The proposal is quite general, which can be used to accomplish the same task for a general type of qubits such as atoms, NV centers, quantum dots, and superconducting qubits.

  • Multiqubit tunable Phase Gate of one qubit simultaneously controlling n qubits in a cavity
    Physical Review A, 2010
    Co-Authors: Chui-ping Yang, Shi-biao Zheng, Franco Nori
    Abstract:

    We propose how to realize a multiqubit tunable Phase Gate of one qubit simultaneously controlling $n$ qubits with four-level quantum systems in a cavity or coupled to a resonator. Each of the $n$ two-qubit controlled-Phase (CP) Gates involved in this multiqubit Phase Gate has a shared control qubit but a {\it different} target qubit. In this propose, the two lowest levels of each system represent the two logical states of a qubit while the two higher-energy intermediate levels are used for the Gate implementation. The method presented here operates essentially by creating a single photon through the control qubit, which then induces a Phase shift to the state of each target qubit. The Phase shifts on each target qubit can be adjusted by changing the Rabi frequencies of the pulses applied to the target qubit systems. The operation time for the Gate implementation is independent of the number of qubits, and neither adjustment of the qubit level spacings nor adjustment of the cavity mode frequency during the Gate operation is required by this proposal. It is also noted that this approach can be applied to implement certain types of significant multiqubit Phase Gates, e.g., the multiqubit Phase Gate consisting of $n$ two-qubit CP Gates which are key elements in quantum Fourier transforms. A possible physical implementation of our approach is presented. Our proposal is quite general, and can be applied to physical systems such as various types of superconducting devices coupled to a resonator and trapped atoms in a cavity.

  • Phase Gate of one qubit simultaneously controlling n qubits in a cavity
    Physical Review A, 2010
    Co-Authors: Chui-ping Yang, Franco Nori
    Abstract:

    We propose how to realize a three-step controlled-Phase Gate of one qubit simultaneously controlling n qubits in a cavity or coupled to a resonator. The n two-qubit controlled-Phase Gates, forming this multiqubit Phase Gate, can be performed simultaneously. The operation time of this Phase Gate is independent of the number n of qubits. This Phase Gate controlling at once n qubits is insensitive to the initial state of the cavity mode and can be used to produce an analogous cnot Gate simultaneously acting on n qubits. We present two alternative approaches to implement this Gate. One approach is based on tuning the qubit frequency while in the other method the resonator frequency is tuned. Using superconducting qubits coupled to a resonator as an example, we show how to implement the proposed Gate with one superconducting qubit simultaneously controlling n qubits selected from N qubits coupled to a resonator (1

  • Phase Gate of one qubit simultaneously controlling n qubits in a cavity
    arXiv: Quantum Physics, 2009
    Co-Authors: Chui-ping Yang, Franco Nori
    Abstract:

    We propose how to realize a three-step controlled-Phase Gate of one qubit simultaneously controlling $n$ qubits in a cavity or coupled to a resonator. The $n$ two-qubit controlled-Phase Gates, forming this multiqubit Phase Gate, can be performed simultaneously. The operation time of this Phase Gate is independent of the number $n$ of qubits. This Phase Gate controlling at once $n$ qubits is insensitive to the initial state of the cavity mode and can be used to produce an analogous CNOT Gate simultaneously acting on $n$ qubits. We present two alternative approaches to implement this Gate. One approach is based on tuning the qubit frequency while the other method tunes the resonator frequency. Using superconducting qubits coupled to a resonator as an example, we show how to implement the proposed Gate with one superconducting qubit simultaneously controlling $n$ qubits selected from $N$ qubits coupled to a resonator ($1Gate with atoms, by using one cavity initially in an arbitrary state.