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30 papers · 2 filters
Faraday Rotation with Single Nuclear Spin Qubit in a High-Finesse Optical Cavity
Nobuyuki Takei, Makoto Takeuchi, Yujiro Eto +4
When an off-resonant light field is coupled with atomic spins, its polarization can rotate depending on the direction of the spins via a Faraday rotation which has been used for mo…
Direct observation of geometric phases using a three-pinhole interferometer
H. Kobayashi, S. Tamate, T. Nakanishi +2
We present a method to measure the geometric phase defined for three internal states of a photon (polarizations) using a three-pinhole interferometer. From the interferogram, we ca…
Effects of photon losses on phase estimation near the Heisenberg limit using coherent light and squeezed vacuum
Takafumi Ono, Holger F. Hofmann
Two path interferometry with coherent states and squeezed vacuum can achieve phase sensitivities close to the Heisenberg limit when the average photon number of the squeezed vacuum…
Quantum Addition Circuits and Unbounded Fan-Out
Yasuhiro Takahashi, Seiichiro Tani, Noboru Kunihiro
We first show how to construct an O(n)-depth O(n)-size quantum circuit for addition of two n-bit binary numbers with no ancillary qubits. The exact size is 7n-6, which is smaller t…
Manipulation of Non-classical Atomic Spin States
Tetsushi Takano, Shin-Ichi-Ro Tanaka, Ryo Namiki +1
We report successful manipulation of non-classical atomic spin states. We generate squeezed spin states by a spin quantum nondemolition measurement, and apply an off-resonant circu…
Deterministic photon-photon (SWAP)^{1/2} gate using a lambda system
Kazuki Koshino, Satoshi Ishizaka, Yasunobu Nakamura
We theoretically present a method to realize a deterministic photon-photon (SWAP)^{1/2} gate using a three-level lambda system interacting with single photons in reflection geometr…