Abstract
Quantum teleportation is a key principle for quantum information technology. It permits the transfer of quantum information into an otherwise inaccessible space, while also permitting the transfer of photon information into a quantum memory without revealing or destroying the stored quantum information. Here, we show reliable quantum state transfer of photon polarization into a carbon isotope nuclear spin coupled to a nitrogen-vacancy center in diamond based on photon-electron Bell state measurement by photon absorption. The carbon spin is first entangled with the electron spin, which is then permitted to absorb a photon into a spin-orbit correlated eigenstate. Detection of the electron after relaxation into the spin ground state allows post-selected transfer of arbitrary photon polarization into the carbon memory. The quantum state transfer scheme allows individual addressing of integrated quantum memories to realize scalable quantum repeaters for long-haul quantum communications, and distributed quantum computers for large-scale quantum computation and metrology.
Highlights
Quantum teleportation is a key principle for quantum information technology
We first prepare an entanglement between electron spin and carbon nuclear spin, and measure photon polarization and electron spin in the Bell basis by photon absorption[23] to transfer the photon polarization state into the carbon spin state (Fig. 1b, c)
The hyperfine coupling of the nitrogen nuclear spin with the electron spin takes a constant value of around 2.2 MHz, while that of the carbon nuclear spin largely depends on its position, becoming smaller with increasing distance from the electron
Summary
Quantum teleportation is a key principle for quantum information technology. It permits the transfer of quantum information into an otherwise inaccessible space, while permitting the transfer of photon information into a quantum memory without revealing or destroying the stored quantum information. We show reliable quantum state transfer of photon polarization into a carbon isotope nuclear spin coupled to a nitrogen-vacancy center in diamond based on photon-electron Bell state measurement by photon absorption. We have recently demonstrated the transfer of photon polarization into a nitrogen nuclear spin in a single nitrogen-vacancy (NV) center in diamond[11]. The stored information is limited to only one nuclear spin per one NV center or one electron spin per one quantum dot, which is a big obstacle for scaling up the memory size. We have recently demonstrated that the quantum state of isolated carbon nuclear spins weakly coupled to the NV center’s electron can be ideally maintained by the geometric spin echo based on time reversal under a zero magnetic field[22]. We experimentally demonstrate that the state transfer process shows quantum nature and the transfer fidelity exceeds the classical limit, based on the quantum process tomography technique
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