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Hybrid Toffoli gate on photons and quantum spins.

Luo MX, Ma SY, Chen XB, Wang X - Sci Rep (2015)

Bottom Line: We present implementations of a key quantum circuit: the three-qubit Toffoli gate.The three general controlled-NOT gates are involved using an auxiliary photon with two degrees of freedom.Our results show that photons and quantum spins may be used alternatively in quantum information processing.

View Article: PubMed Central - PubMed

Affiliation: Information Security and National Computing Grid Laboratory, Southwest Jiaotong University, Chengdu 610031, China.

ABSTRACT
Quantum computation offers potential advantages in solving a number of interesting and difficult problems. Several controlled logic gates, the elemental building blocks of quantum computer, have been realized with various physical systems. A general technique was recently proposed that significantly reduces the realization complexity of multiple-control logic gates by harnessing multi-level information carriers. We present implementations of a key quantum circuit: the three-qubit Toffoli gate. By exploring the optical selection rules of one-sided optical microcavities, a Toffoli gate may be realized on all combinations of photon and quantum spins in the QD-cavity. The three general controlled-NOT gates are involved using an auxiliary photon with two degrees of freedom. Our results show that photons and quantum spins may be used alternatively in quantum information processing.

No MeSH data available.


Toffoli gate on a three-spin system assisted by one photon with two DOFs.cPSi, cBSi, Xi, Hi and Wi are the same as those defined in Fig. 2. ei denote input electron spins. didenote spatial modes of an auxiliary photon D in the state .
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f3: Toffoli gate on a three-spin system assisted by one photon with two DOFs.cPSi, cBSi, Xi, Hi and Wi are the same as those defined in Fig. 2. ei denote input electron spins. didenote spatial modes of an auxiliary photon D in the state .

Mentions: where the electron spins e1 and e2 are the controlling qubits, while the electron spin e3 is the target qubit. The detailed circuit is shown in Fig. 3 by using an auxiliary photon D in the state . This Toffoli gate is realized with the following three controlled gates on electron spins.


Hybrid Toffoli gate on photons and quantum spins.

Luo MX, Ma SY, Chen XB, Wang X - Sci Rep (2015)

Toffoli gate on a three-spin system assisted by one photon with two DOFs.cPSi, cBSi, Xi, Hi and Wi are the same as those defined in Fig. 2. ei denote input electron spins. didenote spatial modes of an auxiliary photon D in the state .
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4644947&req=5

f3: Toffoli gate on a three-spin system assisted by one photon with two DOFs.cPSi, cBSi, Xi, Hi and Wi are the same as those defined in Fig. 2. ei denote input electron spins. didenote spatial modes of an auxiliary photon D in the state .
Mentions: where the electron spins e1 and e2 are the controlling qubits, while the electron spin e3 is the target qubit. The detailed circuit is shown in Fig. 3 by using an auxiliary photon D in the state . This Toffoli gate is realized with the following three controlled gates on electron spins.

Bottom Line: We present implementations of a key quantum circuit: the three-qubit Toffoli gate.The three general controlled-NOT gates are involved using an auxiliary photon with two degrees of freedom.Our results show that photons and quantum spins may be used alternatively in quantum information processing.

View Article: PubMed Central - PubMed

Affiliation: Information Security and National Computing Grid Laboratory, Southwest Jiaotong University, Chengdu 610031, China.

ABSTRACT
Quantum computation offers potential advantages in solving a number of interesting and difficult problems. Several controlled logic gates, the elemental building blocks of quantum computer, have been realized with various physical systems. A general technique was recently proposed that significantly reduces the realization complexity of multiple-control logic gates by harnessing multi-level information carriers. We present implementations of a key quantum circuit: the three-qubit Toffoli gate. By exploring the optical selection rules of one-sided optical microcavities, a Toffoli gate may be realized on all combinations of photon and quantum spins in the QD-cavity. The three general controlled-NOT gates are involved using an auxiliary photon with two degrees of freedom. Our results show that photons and quantum spins may be used alternatively in quantum information processing.

No MeSH data available.