Abstract
The Knill-Laflamme-Milburn (KLM) states have been proved to be a useful resource for quantum information processing [Nature409, 46 (2001)]. For atomic KLM states, several schemes have been put forward based on the time-dependent unitary dynamics, but the dissipative generation of these states has not been reported. This work discusses the possibility for creating different forms of bipartite KLM states in neutral atom system, where the spontaneous emission of excited Rydberg states, combined with the Rydberg antiblockade mechanism, is actively exploited to engineer a steady KLM state from an arbitrary initial state. The numerical simulation of the master equation signifies that a fidelity above 99% is available with the current experimental parameters.
Highlights
It is acknowledged that the generation and stabilization of quantum entanglement [1, 2] is a remarkable research field in quantum information science, which has various practical applications in quantum cryptography [3], quantum superdense coding [4], and quantum teleportation [5]
Utilizing the KLM state, the scalable quantum computation can be performed with the success probability (1−1/n) where n is the number of ancilla
This value is asymptotically close to unity for a large number n, which is a sharp contrast to the success probability of 25% due to the impossibility of performing complete Bell measurement [7, 8]
Summary
It is acknowledged that the generation and stabilization of quantum entanglement [1, 2] is a remarkable research field in quantum information science, which has various practical applications in quantum cryptography [3], quantum superdense coding [4], and quantum teleportation [5]. We compensate the energy shift of Rydberg states by the two-photon detuning and the Stark shifts induced by classical optical lasers, making the atomic spontaneous emission as a powerful resource to create the KLM state, and eliminate the undesired states by a dispersive microwave field. Combined with these operations, the target state becomes the unique steady state of system. The high fidelity entanglement can be realized without states initialization and the precisely evolution time
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