Scheme for implementing N-qubit controlled phase gate of photons assisted by quantum-dot-microcavity coupled system: optimal probability of success

2015 ◽  
Vol 12 (5) ◽  
pp. 055201 ◽  
Author(s):  
Wen-Xue Cui ◽  
Shi Hu ◽  
Hong-Fu Wang ◽  
Ai-Dong Zhu ◽  
Shou Zhang
Keyword(s):  
Quantum Dot ◽  
Coupled System ◽  
Optimal Probability ◽  
System Optimal ◽  
Probability Of Success ◽  
Phase Gate ◽  
Controlled Phase Gate

Scheme for implementing multitarget qubit controlled-NOT gate of photons and controlled-phase gate of electron spins via quantum dot-microcavity coupled system

2016 ◽  
Vol 15 (4) ◽  
pp. 1485-1498 ◽  
Author(s):  
Cheng-Hua Bai ◽  
Dong-Yang Wang ◽  
Shi Hu ◽  
Wen-Xue Cui ◽  
Xin-Xin Jiang ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Coupled System ◽  
Electron Spins ◽  
Phase Gate ◽  
Controlled Phase Gate

scholarly journals Proposal for a destructive controlled phase gate using linear optics

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
S. U. Shringarpure ◽  
J. D. Franson
Keyword(s):  
Linear Optics ◽  
Practical Applications ◽  
Control Qubit ◽  
Probability Of Success ◽  
Average Probability ◽  
Phase Gate ◽  
Controlled Phase Gate ◽  
Target Qubit

AbstractKnill, Laflamme, and Milburn showed that linear optics techniques could be used to implement a nonlinear sign gate. They also showed that two of their nonlinear sign gates could be combined to implement a controlled-phase gate, which has a number of practical applications. Here we describe an alternative implementation of a controlled-phase gate for a single-rail target qubit that only requires the use of a single nonlinear sign gate. This gives a much higher average probability of success when the required ancilla photons are generated using heralding techniques. This implementation of a controlled-phase gate destroys the control qubit, which is acceptable in a number of applications where the control qubit would have been destroyed in any event, such as in a postselection process.

scholarly journals Destructive Controlled-Phase Gate using Linear Optics

2021 ◽  
Author(s):  
S. U. Shringarpure ◽  
J. D. Franson
Keyword(s):  
Linear Optics ◽  
Practical Applications ◽  
Control Qubit ◽  
Probability Of Success ◽  
Average Probability ◽  
Phase Gate ◽  
Controlled Phase Gate

Abstract Knill, Laflamme, and Milburn showed that linear optics techniques could be used to implement a nonlinear sign gate. They also showed that two of their nonlinear sign gates could be combined to implement a controlled-phase gate, which has a number of practical applications. Here we describe an alternative implementation of a controlled-phase gate that only requires the use of a single nonlinear sign gate. This gives a much higher average probability of success when the required ancilla photons are generated using heralding techniques. This implementation of a controlled-phase gate destroys the control qubit, which is acceptable in a number of applications where the control qubit would have been destroyed in any event, such as in a postselection process.

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