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- Thomas Jefferson National Accelerator FacilityUS794 papers
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7 papers · 2 filters
Decomposition of quantum gates
Chi-Kwong Li, Diane Pelejo
A recurrence scheme is presented to decompose an -qubit unitary gate to the product of no more than single qubit gates with small number of controls, where .…
Generating squeezed vacuum field with non-zero orbital angular momentum with atomic ensembles
Mi Zhang, Joseph Soultanis, Irina Novikova +1
We demonstrated that by using a pump field with non-zero orbital angular momentum (OAM) in the polarization self-rotation squeezing process it is possible to generate a squeezed va…
Recursive encoding and decoding of the noiseless subsystem for qudits
Utkan Güngördü, Chi-Kwong Li, Mikio Nakahara +2
We give a full explanation of the noiseless subsystem that protects a single-qubit against collective errors and the corresponding recursive scheme described by C.-K. Li et. al. [P…
Conditions for degradability of tripartite quantum states
Chi-Hang Fred Fung, Chi-Kwong Li, Nung-Sing Sze +1
Alice, Bob, and Eve share a pure quantum state. We introduce the notion of state degradability by asking whether the joint density of Alice and Eve can be transformed to the joint…
Maximal noiseless code rates for collective rotation channels on qudits
Chi-Kwong Li, Mikio Nakahara, Yiu-Tung Poon +1
We study noiseless subsystems on collective rotation channels of qudits, i.e., quantum channels with operators in the set ${\mathcal E}(d,n) = \{ U^{\otimes n}: U \in {\mathrm{SU}}…
Off-axis excitation of hydrogenlike atoms by twisted photons
Andrei Afanasev, Carl E. Carlson, Asmita Mukherjee
We show that the twisted photon states, or photon states with large () angular momentum projection () in the direction of motion, can photoexcite atomic levels for a…