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Decoherence Control for Optical Qubits

David Vitali, P. Tombesi

Lecture notes in computer scienceJan 1, 19992 citations

Realization of a resonant non-linear phase flip in cavity quantum electrodynamics

Holger Friedrich Hofmann, Kunihiro Kojima, Shigeki Takeuchi +1 more

Optical nonlinearities sensitive to individual photons may be extremely useful as elements in quantum logic circuits for photonic qubits. A much cited example is the work of Turchette et al. [Phys. Rev. Lett. 75, 4710 (1995)], in which a phase shift of about 10 degrees was reported. To improve this result, we propose a single sided cavity geometry with minimal cavity losses. It should then be possible to achieve a nonlinear phase shift of 180 degrees.

arXiv:quant-ph/0209151Sep 27, 20020 citations

Teleportation of an entangled atomic state using cavity-assisted collisions

Muhammad Irfan, Mudassar Aqueel Ahmad, Sajid Qamar +1 more

We present a scheme for the teleportation of two-qubit entangled atomic states using the idea of a quantum controlled-NOT gate, based on cavity-assisted collisions proposed by Zheng and Guo (2000 Phys. Rev. Lett. 85 2392). In this scheme, there is only virtual exchange of photons; thus the quantum information is not transferred between the atoms and the cavity field and so the decoherence time of the cavity is greatly enhanced.

Physica ScriptaFeb 3, 20120 citations

A qubit-photon controlled-NOT gate using a quantum dot strongly coupled to a cavity

H. Kim, Ranojoy Bose, Glenn S. Solomon +1 more

International Conference on Solid State Devices and Materials (SSDM)Sep 18, 20150 citations

A qubit-photon controlled-NOT gate using a quantum dot strongly coupled to a cavity

Hyochul Kim, Ranojoy Bose, Thomas C. Shen +2 more

Bulletin of the American Physical SocietyMar 18, 20130 citations

Controlled-Phase Gate Using Dynamically Coupled Cavities and Optical Nonlinearities

Mikkel Heuck, Kurt A. Jacobs, Dirk Englund

We show that relatively simple integrated photonic circuits have the potential to realize a high fidelity deterministic controlled-phase gate between photonic qubits using bulk optical nonlinearities. The gate is enabled by converting travelling continuous-mode photons into stationary cavity modes using strong classical control fields that dynamically change the effective cavity-waveguide coupling rate. This architecture succeeds because it reduces the wave packet distortions that otherwise accompany the action of optical nonlinearities [J. Shapiro, Phys. Rev. A 73, 062305 (2006)PLRAAN1050-294710.1103/PhysRevA.73.062305; J. Gea-Banacloche, Phys. Rev. A 81, 043823 (2010)PLRAAN1050-294710.1103/PhysRevA.81.043823]. We show that high-fidelity gates can be achieved with self-phase modulation in χ^{(3)} materials as well as second-harmonic generation in χ^{(2)} materials. The gate fidelity asymptotically approaches unity with increasing storage time for an incident photon wave packet with fixed duration. We also show that dynamically coupled cavities enable a trade-off between errors due to loss and wave packet distortion. Our proposed architecture represents a new approach to practical implementation of quantum gates that is room-temperature compatible and only relies on components that have been individually demonstrated.We show that relatively simple integrated photonic circuits have the potential to realize a high fidelity deterministic controlled-phase gate between photonic qubits using bulk optical nonlinearities. The gate is enabled by converting travelling continuous-mode photons into stationary cavity modes using strong classical control fields that dynamically change the effective cavity-waveguide coupling rate. This architecture succeeds because it reduces the wave packet distortions that otherwise accompany the action of optical nonlinearities [J. Shapiro, Phys. Rev. A 73, 062305 (2006)PLRAAN1050-294710.1103/PhysRevA.73.062305; J. Gea-Banacloche, Phys. Rev. A 81, 043823 (2010)PLRAAN1050-294710.1103/PhysRevA.81.043823]. We show that high-fidelity gates can be achieved with self-phase modulation in χ^{(3)} materials as well as second-harmonic generation in χ^{(2)} materials. The gate fidelity asymptotically approaches unity with increasing storage time for an incident photon wave packet with fixed duration. We also show that dynamically coupled cavities enable a trade-off between errors due to loss and wave packet distortion. Our proposed architecture represents a new approach to practical implementation of quantum gates that is room-temperature compatible and only relies on components that have been individually demonstrated.

arXiv:1909.05751Physical Review LettersApr 20, 202081 citations

Decoherence Control for Optical Qubits

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Decoherence Control for Optical Qubits

Abstract

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