REALIZATION OF 1 → n CONTROLLED PHASE GATE IN CAVITY QED

2011 ◽  
Vol 09 (02) ◽  
pp. 773-778 ◽  
Author(s):  
PENG XU ◽  
LIE WU ◽  
NIAN-QUAN JIANG
Keyword(s):  
Cavity Qed ◽  
Operation Time ◽  
Current Technology ◽  
Control Qubit ◽  
Phase Gate ◽  
Controlled Phase Gate

A scheme for realizing a multi-qubit phase gate with one control qubit simultaneously controlling n target qubits in a cavity QED system is proposed. The operation time of the gate is independent of the number n of qubits. The realizability of the gate with current technology is also discussed.

Realizing an N-two-qubit quantum logic gate in a cavity QED with nearest qubit--qubit interaction

2016 ◽  
Vol 16 (5&6) ◽  
pp. 465-482
Author(s):  
Taoufik Said ◽  
Abdelhaq Chouikh ◽  
Karima Essammouni ◽  
Mohamed Bennai
Keyword(s):  
Quantum Logic ◽  
Cavity Qed ◽  
Logic Gate ◽  
Operation Time ◽  
Logic Gates ◽  
Initial State ◽  
Gate Operation ◽  
Quantum Logic Gates ◽  
Current State ◽  
Phase Gate

We propose an effective way for realizing a three quantum logic gates (NTCP gate, NTCP-NOT gate and NTQ-NOT gate) of one qubit simultaneously controlling N target qubits based on the qubit-qubit interaction. We use the superconducting qubits in a cavity QED driven by a strong microwave field. In our scheme, the operation time of these gates is independent of the number N of qubits involved in the gate operation. These gates are insensitive to the initial state of the cavity QED and can be used to produce an analogous CNOT gate simultaneously acting on N qubits. The quantum phase gate can be realized in a time (nanosecond-scale) much smaller than decoherence time and dephasing time (microsecond-scale) in cavity QED. Numerical simulation under the influence of the gate operations shows that the scheme could be achieved efficiently within current state-of-the-art technology.

Realization of Three-Qubit Controlled-Phase Gate Operation with Atoms in Cavity QED System

2009 ◽  
Vol 26 (2) ◽  
pp. 020310 ◽  
Author(s):  
Tang Shi-Qing ◽  
Zhang Deng-Yu ◽  
Xie Li-Jun ◽  
Zhan Xiao-Gui ◽  
Gao Feng
Keyword(s):  
Cavity Qed ◽  
Gate Operation ◽  
Phase Gate ◽  
Controlled Phase Gate

Implementation of quantum controlled phase gate and preparation of multiparticle entanglement in cavity QED

2011 ◽  
Vol 20 (6) ◽  
pp. 060306 ◽  
Author(s):  
Xi Wu ◽  
Zhi-Hua Chen ◽  
Yong Zhang ◽  
Yue-Hua Chen ◽  
Ming-Yong Ye ◽  
...  
Keyword(s):  
Cavity Qed ◽  
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.

ontrolled implementation of two-photon controlled phase gate within a network

2010 ◽  
Vol 10 (9&10) ◽  
pp. 821-828
Author(s):  
Yan Xia ◽  
Jie Song ◽  
Zhen-Biao Yang ◽  
Shi-Biao Zheng
Keyword(s):  
Quantum Computer ◽  
Photon Detectors ◽  
Optical Elements ◽  
Experimental Realization ◽  
Two Photon ◽  
Phase Gate ◽  
Controlled Phase Gate ◽  
Linear Optical ◽  
Polarized Photons ◽  
Linear Optical Elements

We propose a protocol to controlled implement the two-photon controlled phase gate within a network by using interference of polarized photons. The realization of this protocol is appealing due to the fact that the quantum state of light is robust against the decoherence, and photons are ideal carriers for transmitting quantum information over long distances. The proposed setup involves simple linear optical elements and the conventional photon detectors that only distinguish the vacuum and nonvacuum Fock number states. This can greatly simplify the experimental realization of a linear optical quantum computer.

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