Efficient quantum computation using coherent states

Jeong, Hyunseok; Kim, M. S.

doi:10.1103/physreva.65.042305

Cited by 389 publications

(364 citation statements)

References 16 publications

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“…Here cavities 2 and 3 are both in a Schrödinger cat state and entangled with each other. This kind of entangled state is of great interest for quantum teleportation [27] and quantum computing with coherent states [28], but also for studying quantum phenomena in general, like entanglement and decoherence in the classical limit [29]. Using a 50/50 beam splitter, this state may be transformed into | √ 2β, 0 +(−1) i |− √ 2β, 0 , i.e.…”

Section: State Preparation Using Adiabatic Transfer and Atomic Mementioning

confidence: 99%

Cavity-state preparation using adiabatic transfer

Larson¹,

Andersson²

2005

Phys. Rev. A

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We show how to prepare a variety of cavity field states for multiple cavities. The state preparation technique used is related to the method of stimulated adiabatic Raman passage or STIRAP. The cavity modes are coupled by atoms, making it possible to transfer an arbitrary cavity field state from one cavity to another, and also to prepare non-trivial cavity field states. In particular, we show how to prepare entangled states of two or more cavities, such as an EP R state and a W state, as well as various entangled superpositions of coherent states in different cavities, including Schrödinger cat states. The theoretical considerations are supported by numerical simulations.

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Section: State Preparation Using Adiabatic Transfer and Atomic Mementioning

confidence: 99%

Cavity-state preparation using adiabatic transfer

Larson¹,

Andersson²

2005

Phys. Rev. A

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“…An alternative approach employs coherent states as the qubit basis, {|α , | − α } [17,18], where ±α are amplitudes of the coherent states. It enables one to implement a nearly deterministic Bell-state measurement [18][19][20]. However, due to the non-orthogonality of two coherent states, |α and | − α , a necessary operation to finish the teleportation process such as the Pauli-Z operation cannot be performed in a deterministic way and produces additional errors [7,8].…”

Section: Introductionmentioning

confidence: 99%

Two different types of optical hybrid qubits for teleportation in a lossy environment

Kim

Lee

Jeong

2016

Quantum Inf Process

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We investigate the performance of quantum teleportation under a lossy environment using two different types of optical hybrid qubits. One is the hybrid of the vacuum and single-photon states with coherent states and the other is the hybrid of polarized single-photon states with coherent states. We have shown that the hybrid qubit using vacuum and single-photon states is generally more robust to photon loss effects compared to the one using the photon polarization with respect to fidelities and success probabilities of quantum teleportation.

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“…As non-Gaussian continuous-variable states have rich structures in the phase space, it is important to explore possibility of efficient Bell inequality tests using those states. Among non-Gaussian continuous-variable states, superpositions of two coherent states (SCSs) [10,11] in free-traveling optical fields have been found a very useful tool for fundamental tests of quantum theory [12,13,14,15,16,17] as well as for quantum information applications [18,19,20,21,22,23]. In particular, they are useful for Bell inequality tests using various measurements such as photon on/off detection, photon number detection, and homodyne detection [12,13,14,15].…”

Section: Introductionmentioning

confidence: 99%

Effects of squeezing on quantum nonlocality of superpositions of coherent states

Lee

Jeong

2009

Phys. Rev. A

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We analyze effects of squeezing upon superpositions of coherent states (SCSs) and entangled coherent states (ECSs) for Bell-inequality tests. We find that external squeezing can always increase the degrees of Bell violations, if the squeezing direction is properly chosen, for the case of photon parity measurements. On the other hand, when photon on/off measurements are used, the squeezing operation can enhance the degree of Bell violations only for moderate values of amplitudes and squeezing. We point out that a significant improvement is required over currently available squeezed SCSs in order to directly demonstrate a Bell-inequality violation in a real experiment.

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Efficient quantum computation using coherent states

Abstract: Universal quantum computation using optical coherent states is studied. A teleportation scheme for a coherent-state qubit is developed and applied to gate operations. This scheme is shown to be robust to detection inefficiency.PACS number(s); 03.67. 03.67.Lx,

Cited by 389 publications

References 16 publications

Cavity-state preparation using adiabatic transfer

Cavity-state preparation using adiabatic transfer

Two different types of optical hybrid qubits for teleportation in a lossy environment

Effects of squeezing on quantum nonlocality of superpositions of coherent states

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