Multi-target-qubit unconventional geometric phase gate in a multi-cavity system

Liu, Tong; Cao, Xiao-Zhi; Su, Qi-Ping; Xiong, Shao-Jie; Yang, Chui‐Ping

doi:10.1038/srep21562

Cited by 21 publications

(18 citation statements)

References 87 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6 (a) and 6 (b), we choose the inter-cavity crosstalk coupling strengths g AB = 0.1g and g AB = 0.01g, respectively. These the coupling strength conditions are easily satisfied by the present circuit QED technology [50]. Figure 6 (a) and 6 (b) show output fidelities from the master equation simulation, which take into account the inhomogeneity in transmon-cavity interaction for the case of (i) the state |g acts as a control state and (ii) the state |f acts as a control state, respectively.…”

Section: Possible Experimental Implementationmentioning

confidence: 87%

Creation of superposition of arbitrary states encoded in two high-Q cavities

Liu¹,

Zhang²,

Guo³

et al. 2019

Opt. Express

Self Cite

View full text Add to dashboard Cite

The principle of superposition is a key ingredient for quantum mechanics. A recent work [M. Oszmaniec et al., Phys. Rev. Lett. 116, 110403 (2016)] has shown that a quantum adder that deterministically generates a superposition of two unknown states is forbidden. Here we propose a probabilistic approach for creating a superposition state of two arbitrary states encoded in two three-dimensional cavities. Our implementation is based on a three-level superconducting transmon qubit dispersively coupled to two cavities. Numerical simulations show that high-fidelity generation of the superposition of two coherent states is feasible with current circuit QED technology. Our method also works for other physical systems such as other types of superconducting qubits, natural atoms, quantum dots, and nitrogen-vacancy (NV) centers.

show abstract

Section: Possible Experimental Implementationmentioning

confidence: 87%

Creation of superposition of arbitrary states encoded in two high-Q cavities

Liu¹,

Zhang²,

Guo³

et al. 2019

Opt. Express

Self Cite

View full text Add to dashboard Cite

show abstract

“…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%

“…Different from previous works [4,[19][20][21][22][23][24][25][26][27][28][29][30][31][32][33], in the following we will propose a method to implement an n-qubit controlled phase gate of n − 1 controlled qubits simultaneously controlling a single target qubit, with n qubits in n different cavities coupled to an auxiliary qutrit [ Fig. 2(a)].…”

Section: Introductionmentioning

confidence: 99%

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

Zheng

Yang

2018

Phys. Rev. A

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…How to efficiently implement this multiqubit gate becomes necessary and important. Over the past years, based on cavity QED or circuit QED, many efficient methods have been proposed for the direct implementation of this multiqubit phase gate, by using natural atoms or artificial atoms (e.g., superconducting qubits, quantum dots, or nitrogen-vacancy center ensembles) [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…Circuit QED is analogue of cavity QED, which consists of superconducting qubits and microwave resonators or cavities. It has developed fast recently and is considered as one of the most promising candidates for QIP [23][24][25][26][27][28][29]. Owing to the microfabrication technology scalability, individual qubit addressability, and ever-increasing qubit coherence time [30][31][32][33][34][35][36][37][38], superconducting qubits are of great importance in QIP.…”

Section: Introductionmentioning

confidence: 99%

Circuit QED: single-step realization of a multiqubit controlled phase gate with one microwave photonic qubit simultaneously controlling n − 1 microwave photonic qubits

Ye¹,

Zheng²,

Yu³

et al. 2018

Opt. Express

Self Cite

View full text Add to dashboard Cite

We present a novel method to realize a multi-target-qubit controlled phase gate with one microwave photonic qubit simultaneously controlling n − 1 target microwave photonic qubits. This gate is implemented with n microwave cavities coupled to a superconducting flux qutrit. Each cavity hosts a microwave photonic qubit, whose two logic states are represented by the vacuum state and the single photon state of a single cavity mode, respectively. During the gate operation, the qutrit remains in the ground state and thus decoherence from the qutrit is greatly suppressed.This proposal requires only a single-step operation and thus the gate implementation is quite simple. The gate operation time is independent of the number of the qubits. In addition, this proposal does not need applying classical pulse or any measurement. Numerical simulations demonstrate that high-fidelity realization of a controlled phase gate with one microwave photonic qubit simultaneously controlling two target microwave photonic qubits is feasible with current circuit QED technology. The proposal is quite general and can be applied to implement the proposed gate in a wide range of physical systems, such as multiple microwave or optical cavities coupled to a natural or artificial Λ-type three-level atom.

show abstract

Multi-target-qubit unconventional geometric phase gate in a multi-cavity system

Cited by 21 publications

References 87 publications

Creation of superposition of arbitrary states encoded in two high-Q cavities

Creation of superposition of arbitrary states encoded in two high-Q cavities

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

Circuit QED: single-step realization of a multiqubit controlled phase gate with one microwave photonic qubit simultaneously controlling n − 1 microwave photonic qubits

Contact Info

Product

Resources

About