Measurement-induced entanglement of two transmon qubits by a single photon
Measurement-induced entanglement of two transmon qubits by a single photon
复制标题
单个光子测量引起的两个传输量子位的纠缠
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
F. Hassler
中科院分区：
文献类型：
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作者：
C. Ohm;F. Hassler
远距离量子比特之间按需产生纠缠是分布式量子计算的必要组成部分。我们提出了一种纠缠方案，该方案允许单次确定纠缠的产生，通过检测单个光子通过马赫-曾德干涉仪，每个臂上有一个transmon量子比特。纠缠的产生本质上依赖于这样一个事实，即超导微波结构允许人们在量子比特和光子之间实现强耦合。通过光子计数器检测光子，实现奇偶测量，并将两个量子位的波函数投射到最大纠缠态上。最重要的是，由于单光子不可分割的性质，我们的协议不容易受到光子损失的影响。
On-demand creation of entanglement between distant qubits is a necessary ingredient for distributed quantum computation. We propose an entanglement scheme that allows for single-shot deterministic entanglement creation by detecting a single photon passing through a Mach–Zehnder interferometer with one transmon qubit in each arm. The entanglement production essentially relies on the fact that superconducting microwave structures allow one to achieve strong coupling between the qubit and the photon. By detecting the photon via a photon counter, a parity measurement is implemented and the wave function of the two qubits is projected onto a maximally entangled state. Most importantly, the entanglement generation is heralded such that our protocol is not susceptible to photon loss due to the indivisible nature of single photons.