One-step implementation of a multiqubit phase gate with one control qubit and multiple target qubits in coupled cavities

Wang, Hong-Fu; Zhu, Ai‐Dong; Zhang, Shou

doi:10.1364/ol.39.001489

Cited by 37 publications

(24 citation statements)

References 35 publications

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“…The core element in our approach is the XPM technique, which enables an efficient way to quantum computation. This technique recently has been used widely for quantum logic gates [9][10][11][12][13][14][15][16][17][18][36][37][38][39], cluster or graph state generations [40][41][42][43][44], entanglement concentration [45][46][47][48][49][50][51][52], entangled states generation [53][54][55][56], and others [57][58][59][60][61][62][63][64][65][66][67][68], etc. Its feasibility had been demonstrated in theory [69][70][71][72][73], even the multi-mode effect is taken into account.…”

Section: Discussionmentioning

confidence: 99%

Multiple multicontrol unitary operations: Implementation and applications

Lin

2018

Sci. China Phys. Mech. Astron.

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How to implement a computation task efficiently is the central problem in quantum computation science. For a quantum circuit, the multi-control unitary operations are the very important components. We present an extremely efficient approach to implement multiple multi-control unitary operations directly without any decompositions to CNOT gates and single-photon gates. The necessary two-photon operations could be reduced from O(n 3 ) with the traditional decomposition approach to O(n) with the present approach, which will greatly relax the requirement resources and make this approach much feasible for large scale quantum computation. Moreover, the potential application to the (n-k)-uniform hypergraph state generation is proposed.multi-control unitary operation, cross phase modulation, c-path gate, merging gate, hypergraph state PACS number(s): 03.67. Lx, 42.50.Dv Citation:

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Section: Discussionmentioning

confidence: 99%

Multiple multicontrol unitary operations: Implementation and applications

Lin

2018

Sci. China Phys. Mech. Astron.

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“…The result (21) was derived under the conditions (5), (6), (18) and (19) given above. The conditions (5) and (18) can be satisfied by choosing g 1 = g 2 and g 3 = g 4 .…”

Section: Transfer Of Quantum Entangled States Of Two Cqubitsmentioning

confidence: 99%

Transferring entangled states of photonic cat-state qubits in circuit QED

et al. 2020

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We propose a method for transferring quantum entangled states of two photonic cat-state qubits (cqubits) from two microwave cavities to the other two microwave cavities. This proposal is realized by using four microwave cavities coupled to a superconducting flux qutrit. Because of using four cavities with different frequencies, the inter-cavity crosstalk is significantly reduced. Since only one coupler qutrit is used, the circuit resources is minimized. The entanglement transfer is completed with a single-step operation only, thus this proposal is quite simple. The third energy level of the coupler qutrit is not populated during the state transfer, therefore decoherence from the higher energy level is greatly suppressed. Our numerical simulations show that high-fidelity transfer of two-cqubit entangled states from two transmission line resonators to the other two transmission line resonators is feasible with current circuit QED technology. This proposal is universal and can be applied to accomplish the same task in a wide range of physical systems, such as four microwave or optical cavities, which are coupled to a natural or artificial three-level atom.

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“…Refs. [4,[30][31][32][33] discussed on how to implement a multi-target-qubit gate with natural or artificial atoms placed in or coupled to a single cavity.…”

Section: Introductionmentioning

confidence: 99%

Multiplex-controlled phase gate with qubits distributed in a multicavity system

Zheng

Yang

2018

Phys. Rev. A

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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.

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One-step implementation of a multiqubit phase gate with one control qubit and multiple target qubits in coupled cavities

Cited by 37 publications

References 35 publications

Multiple multicontrol unitary operations: Implementation and applications

Multiple multicontrol unitary operations: Implementation and applications

Transferring entangled states of photonic cat-state qubits in circuit QED

Multiplex-controlled phase gate with qubits distributed in a multicavity system

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