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International Journal of Quantum Information

REMOTE FIELD AND ATOMIC STATE PREPARATION

Rameez‐ul Islam, Manzoor Ikram, Ashfaq H. Khosa, Farhan Saif

Published Apr 1, 2008• 6 citations

Abstract

A scheme for remote preparation of field (atomic) states is proposed. Protocol execution requires cavity QED based atom-field interactions successively supplemented with Ramsey interferometry. The state to be remotely prepared at the receiver's end is acquired by deterministically manipulating the sender's component of the pre-shared entangled state. In the case of field entanglement, it is carried out with the help of an atom that passes through the sender's cavity and then traverses a classical external field for specified times prior to detection. However, for atomic entangled states, only interactions with the classical field suffice to complete the task. The scheme guarantees good success probability with high fidelity and requires one bit of classical communication.

DOI: 10.1142/s0219749908003517

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A scheme for remote preparation of field (atomic) states is proposed. Protocol execution requires cavity QED based atom-field interactions successively supplemented with Ramsey interferometry. The state to be remotely prepared at the receiver's end is acquired by deterministically manipulating the sender's component of the pre-shared entangled state. In the case of field entanglement, it is carried out with the help of an atom that passes through the sender's cavity and then traverses a classical external field for specified times prior to detection. However, for atomic entangled states, only interactions with the classical field suffice to complete the task. The scheme guarantees good success probability with high fidelity and requires one bit of classical communication.

Abstract A physical protocol for joint preparation of a single atomic qubit state remotely in the context of an atom system from two senders and one receiver spatially separated is proposed. A triatomic entangled W-type state is used as the quantum channel, and the control of the state of a single two-level atom can be achieved by the interaction of the atom and the classical field. We show that the joint remote state preparation of an atomic single qubit can be successful in a probabilistic manner under the condition that the classical information of the single-qubit state is split in the correct way.

In this paper, a physical scheme for remotely preparing a diatomic entangled state via a two-atom entangled state and a triatomical entangled W state is presented by applying the cavity quantum electrodynamics technique. The original state can be transmitted to either one of the receivers by introducing a auxiliary cavity. Two different kinds of atom-cavity interactions are utilized at the sender's and the receiver's site, respectively. The total success probability for each receiver is obtained, which will be equal in certain condition.

In this paper, a scheme is proposed for remote state preparation (RSP) with cavity quantum electrodynamics (QED). In our scheme, two observers share two-atom nonmaximally entangled state as quantum channels and can realize remote preparation of state of an atom. We also propose a generalization for remote preparation of N -atom entangled state by ( N +1)-atom GHZ-like state ( N ≥ 2). By this scheme, one single-atom projective measurement is enough for the RSP of a qubit or N -atom entangled state, and the probability of success for RSP is unity. Furthermore, we have considered the case where observers use W-like state as quantum channels to realize RSP of a qubit. We compare our scheme with existing ones.

We experimentally demonstrate a protocol of probabilistic remote state preparation by virtue of entanglement, local operation and forward classical communications. Arbitrary polarization qubit state can be remotely prepared with this protocol. For both pure states and mixed states, the average efficiency is no less than 50% and the classical information cost is 1 bit. All 18 remotely prepared states were estimated with quantum state tomography system. The fidelities are all above 0.99, with average fidelity being 0.9956.