Quantum manipulation of cavity fields using atomic coherence and entanglement = 원자 간섭성과 얽힘을 이용한 공동 장의 양자 제어

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We study manipulation of cavity fields via interaction between a cavity field and atoms. Firstly, we give theoretical analysis of a cavity field which interacts with a four-level double-$\Lambda$ atom. While the cavity field interacts with two atomic transitions, two other atomic transitions are driven by two classical fields. It is found that our system always works as a phase sensitive linear amplifier with no window for a phase insensitive linear amplifier. We also show that the system behaves as a two-photon correlated emission laser under certain conditions. Secondly, theoretical analysis is given of an experimental scheme that can perform individual photon operations such as the photon annihilation operation $\alpha$, creation operation $a^{\dag}$ and commutation operation $\alpha\alpha^{\dagger}$-$\alpha\alpha^{\dagger}$, utilizing atom-cavity field interactions and conditional measurements. In order for the scheme to perform the desired photon operation, the atom-cavity field interaction times are generally required to be sufficiently short that photon annihilation and/or creation are dominated by the one-half Rabi cycle process. Such short interaction times, however, lead inevitably to a low success probability of the scheme. It is shown that this problem of low success probability can be overcome by preparing the cavity field in a superposition of a small number(two) of Fock states and choosing the interaction times appropriately. We also address the problem of validating the value of the commutator for which we can assume $[$\alpha,\alpha^{\dagger}$]=$\It{K}$$. We present a scheme to determine the value of $\It{K}$ using the interaction of an initially excited two level atom with the cavity field and the conditional probability for the atom to remain excited after the interaction.
Lee, Hai-Woongresearcher이해웅researcher
한국과학기술원 : 물리학과,
Issue Date
418652/325007  / 020037913

학위논문(박사) - 한국과학기술원 : 물리학과, 2010.2, [ v, 55 p. ]


boson commutator; correlated emission laser; linear amplifier; cavity QED; annihilation creation operator; 소멸 생성 연산자; 보존 교환자; 상관 방출 레이저; 선형 증폭기; 공동 전기역학

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