论文标题
双传输耦合器：快速两Q Qubit的门，没有残留的耦合，用于高度失调的超导码头
Double-Transmon Coupler: Fast Two-Qubit Gate with No Residual Coupling for Highly Detuned Superconducting Qubits
论文作者
论文摘要
尽管对于通用量子计算是必不可少的，但众所周知，它们很难以高保真度实施。最近，可调耦合器已成为实现超导量子计算机中高保真两分之二门的关键组成部分。但是，仍然很难获得可调节的耦合，而没有不需要的残留耦合来实现高度引起的量子，这对于减轻Qubit频率拥挤或由于量子之间的串扰而引起的错误是可取的。因此，我们为这种可调耦合器提出了一种设计，我们称之为双transmon耦合器，因为这是由两个通过公共环路和额外的约瑟夫森交界处耦合的transmon Qubits组成的。控制循环中的磁通量，我们不仅可以达到快速的高保真两分之二的大门，而且在空闲时间内也没有残留耦合，在这种情况下，计算量子台的固定固定频率很高。预计所提出的耦合器将为高性能超导量子计算机提供另一种方法。
Although two-qubit entangling gates are necessary for universal quantum computing, they are notoriously difficult to implement with high fidelity. Recently, tunable couplers have become a key component for realizing high-fidelity two-qubit gates in superconducting quantum computers. However, it is still difficult to achieve tunable coupling free of unwanted residual coupling for highly detuned qubits, which are desirable for mitigating qubit-frequency crowding or errors due to crosstalk between qubits. We thus propose a design for this kind of tunable coupler, which we call a double-transmon coupler, because this is composed of two transmon qubits coupled through a common loop with an additional Josephson junction. Controlling the magnetic flux in the loop, we can achieve not only fast high-fidelity two-qubit gates, but also no residual coupling during idle time, where computational qubits are highly detuned fixed-frequency transmons. The proposed coupler is expected to offer an alternative approach to higher-performance superconducting quantum computers.
