LINEAR OPTICAL IMPLEMENTATION OF DISCRETE QUANTUM FOURIER TRANSFORM WITH CONVENTIONAL PHOTON DETECTORS

2011 ◽  
Vol 09 (01) ◽  
pp. 509-518 ◽  
Author(s):  
HONG-FU WANG ◽  
SHOU ZHANG ◽  
KYU-HWANG YEON
Keyword(s):  
Fourier Transform ◽  
Success Probability ◽  
Optical Scheme ◽  
Quantum Fourier Transform ◽  
Photon Polarization ◽  
Photon Detectors ◽  
Optical Elements ◽  
Two Photon ◽  
Complex Linear ◽  
Linear Optical

We present a linear optical scheme for implementing two-bit discrete quantum Fourier transform based only on simple linear optical elements, a pair of two-photon polarization entangled states, and the conventional photon detectors that only distinguish between the presence and absence of the photons. The scheme can be implemented with a certain success probability, and the implementation of the scheme in experiment would be an important step towards more complex linear optical quantum computation.

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.

LINEAR OPTICAL PROTOCOL FOR GENERATION OF W STATE WITHIN A NETWORK

2010 ◽  
Vol 08 (07) ◽  
pp. 1199-1206 ◽  
Author(s):  
PEI-MIN LU ◽  
YAN XIA ◽  
JIE SONG ◽  
HE-SHAN SONG
Keyword(s):  
Single Photon ◽  
W State ◽  
Entangled State ◽  
Photon Polarization ◽  
Photon Detectors ◽  
Optical Elements ◽  
Classical Communication ◽  
Linear Optical ◽  
Linear Optical Elements

We demonstrate a linear optical protocol to generate W state in terms of optical elements within a network. The proposed setup involves simple linear optical elements, N-photon polarization entangled state, and conventional photon detectors that only distinguish the vacuum and nonvacuum Fock number states. We show that with local operations, single-photon measurement, and one way classical communication, the protocol can be successfully realized with a certain probability.

EFFICIENT SCHEME FOR PREPARING POLARIZATION-ENTANGLED PHOTONIC CLUSTER STATES BASED ON CROSS-KERR NONLINEARITY

2011 ◽  
Vol 09 (05) ◽  
pp. 1319-1327
Author(s):  
MENG-ZHENG ZHU ◽  
GUANG-YU YUAN
Keyword(s):  
Cluster State ◽  
Success Probability ◽  
Kerr Nonlinearity ◽  
Optical Systems ◽  
Distinct Advantage ◽  
Optical Elements ◽  
Cluster States ◽  
Present Scheme ◽  
Linear Optical ◽  
High Success Probability

A scheme is proposed for generating a polarization four-photon cluster, which is believed to be suitable to achieve the one-way quantum computing via single-qubit projective measurements, with the help of only cross-Kerr nonlinearity and current linear optical systems. Compared with the existing schemes, the distinct advantage of the present scheme is that cluster states can be achieved with high success probability close to unity. Our scheme is experimentally demanding but efficient. Based on the present scheme, the cluster state of 3N + 1 photons can be obtained with the help of linear optical elements.

NEW EXPERIMENTAL PROTOCOL OF TELEPORTING AN ARBITRARY SINGLE-QUBIT STATE BY USING HYPERENTANGLED PHOTON PAIRS

2009 ◽  
Vol 07 (08) ◽  
pp. 1515-1520
Author(s):  
WEN-ZHEN CAO ◽  
YAN-HUA WU ◽  
CHONG LI
Keyword(s):  
Qubit State ◽  
Experimental Protocol ◽  
Photon Detectors ◽  
Optical Elements ◽  
Single Qubit ◽  
Photon Pairs ◽  
Linear Optical ◽  
Set Up ◽  
Photon Source ◽  
Linear Optical Elements

A new experimental protocol of teleportation is proposed by using hyperentangled photon pairs, and by this protocol the probability approaches unity. This set-up is made of hyper-entangled photon source, linear optical elements and conventional photon detectors.

NONLOCAL CLONING FOR A STATE NEAR A GIVEN ONE WITH SINGLE-PHOTON INTERFERENCE

2009 ◽  
Vol 07 (07) ◽  
pp. 1331-1336 ◽  
Author(s):  
YANG SHAO ◽  
YAN-HUI ZHOU ◽  
AI-DONG ZHU
Keyword(s):  
Single Photon ◽  
Success Probability ◽  
High Fidelity ◽  
Optical Scheme ◽  
Present Scheme ◽  
Linear Optical ◽  
Photon Loss ◽  
Flying Qubit

A linear optical scheme is proposed for implementing a nonlocal cloning machine which copies a state near a given one with single-photon interference. We combine the advantages of photons and atoms by adopting two three level atoms as the storing qubits and a polarized photon as the flying qubit, and the photon loss events are also considered. With our present scheme, a high-fidelity cloning machine is realized at the expense of the success probability.

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